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| </pre><pre class="rust "> |
| <span class="doccomment">//! A simple binary heap with support for removal of arbitrary elements</span> |
| <span class="doccomment">//!</span> |
| <span class="doccomment">//! This heap is used to manage timer state in the event loop. All timeouts go</span> |
| <span class="doccomment">//! into this heap and we also cancel timeouts from this heap. The crucial</span> |
| <span class="doccomment">//! feature of this heap over the standard library's `BinaryHeap` is the ability</span> |
| <span class="doccomment">//! to remove arbitrary elements. (e.g. when a timer is canceled)</span> |
| <span class="doccomment">//!</span> |
| <span class="doccomment">//! Note that this heap is not at all optimized right now, it should hopefully</span> |
| <span class="doccomment">//! just work.</span> |
| |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>; |
| |
| <span class="kw">use</span> <span class="ident">slab</span>::<span class="ident">Slab</span>; |
| |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Heap</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { |
| <span class="comment">// Binary heap of items, plus the slab index indicating what position in the</span> |
| <span class="comment">// list they're in.</span> |
| <span class="ident">items</span>: <span class="ident">Vec</span><span class="op"><</span>(<span class="ident">T</span>, <span class="ident">usize</span>)<span class="op">></span>, |
| |
| <span class="comment">// A map from a slab index (assigned to an item above) to the actual index</span> |
| <span class="comment">// in the array the item appears at.</span> |
| <span class="ident">index</span>: <span class="ident">Slab</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>, |
| } |
| |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Slot</span> { |
| <span class="ident">idx</span>: <span class="ident">usize</span>, |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Ord</span><span class="op">></span> <span class="ident">Heap</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-></span> <span class="ident">Heap</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { |
| <span class="ident">Heap</span> { |
| <span class="ident">items</span>: <span class="ident">Vec</span>::<span class="ident">new</span>(), |
| <span class="ident">index</span>: <span class="ident">Slab</span>::<span class="ident">with_capacity</span>(<span class="number">128</span>), |
| } |
| } |
| |
| <span class="doccomment">/// Pushes an element onto this heap, returning a slot token indicating</span> |
| <span class="doccomment">/// where it was pushed on to.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// The slot can later get passed to `remove` to remove the element from the</span> |
| <span class="doccomment">/// heap, but only if the element was previously not removed from the heap.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">push</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">t</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">Slot</span> { |
| <span class="self">self</span>.<span class="ident">assert_consistent</span>(); |
| <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">items</span>.<span class="ident">len</span>(); |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">index</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="self">self</span>.<span class="ident">index</span>.<span class="ident">capacity</span>() { |
| <span class="self">self</span>.<span class="ident">index</span>.<span class="ident">reserve_exact</span>(<span class="ident">len</span>); |
| } |
| <span class="kw">let</span> <span class="ident">slot_idx</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">index</span>.<span class="ident">insert</span>(<span class="ident">len</span>); |
| <span class="self">self</span>.<span class="ident">items</span>.<span class="ident">push</span>((<span class="ident">t</span>, <span class="ident">slot_idx</span>)); |
| <span class="self">self</span>.<span class="ident">percolate_up</span>(<span class="ident">len</span>); |
| <span class="self">self</span>.<span class="ident">assert_consistent</span>(); |
| <span class="ident">Slot</span> { <span class="ident">idx</span>: <span class="ident">slot_idx</span> } |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">peek</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">T</span><span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">assert_consistent</span>(); |
| <span class="self">self</span>.<span class="ident">items</span>.<span class="ident">get</span>(<span class="number">0</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> <span class="kw-2">&</span><span class="ident">i</span>.<span class="number">0</span>) |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { |
| <span class="self">self</span>.<span class="ident">assert_consistent</span>(); |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">items</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">0</span> { |
| <span class="kw">return</span> <span class="prelude-val">None</span> |
| } |
| <span class="kw">let</span> <span class="ident">slot</span> <span class="op">=</span> <span class="ident">Slot</span> { <span class="ident">idx</span>: <span class="self">self</span>.<span class="ident">items</span>[<span class="number">0</span>].<span class="number">1</span> }; |
| <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">remove</span>(<span class="ident">slot</span>)) |
| } |
| |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">remove</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">slot</span>: <span class="ident">Slot</span>) <span class="op">-></span> <span class="ident">T</span> { |
| <span class="self">self</span>.<span class="ident">assert_consistent</span>(); |
| <span class="kw">let</span> <span class="ident">idx</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">index</span>.<span class="ident">remove</span>(<span class="ident">slot</span>.<span class="ident">idx</span>); |
| <span class="kw">let</span> (<span class="ident">item</span>, <span class="ident">slot_idx</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">items</span>.<span class="ident">swap_remove</span>(<span class="ident">idx</span>); |
| <span class="macro">debug_assert_eq</span><span class="macro">!</span>(<span class="ident">slot</span>.<span class="ident">idx</span>, <span class="ident">slot_idx</span>); |
| <span class="kw">if</span> <span class="ident">idx</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">items</span>.<span class="ident">len</span>() { |
| <span class="self">self</span>.<span class="ident">index</span>[<span class="self">self</span>.<span class="ident">items</span>[<span class="ident">idx</span>].<span class="number">1</span>] <span class="op">=</span> <span class="ident">idx</span>; |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">items</span>[<span class="ident">idx</span>].<span class="number">0</span> <span class="op"><</span> <span class="ident">item</span> { |
| <span class="self">self</span>.<span class="ident">percolate_up</span>(<span class="ident">idx</span>); |
| } <span class="kw">else</span> { |
| <span class="self">self</span>.<span class="ident">percolate_down</span>(<span class="ident">idx</span>); |
| } |
| } |
| <span class="self">self</span>.<span class="ident">assert_consistent</span>(); |
| <span class="kw">return</span> <span class="ident">item</span> |
| } |
| |
| <span class="kw">fn</span> <span class="ident">percolate_up</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">idx</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">usize</span> { |
| <span class="kw">while</span> <span class="ident">idx</span> <span class="op">></span> <span class="number">0</span> { |
| <span class="kw">let</span> <span class="ident">parent</span> <span class="op">=</span> (<span class="ident">idx</span> <span class="op">-</span> <span class="number">1</span>) <span class="op">/</span> <span class="number">2</span>; |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">items</span>[<span class="ident">idx</span>].<span class="number">0</span> <span class="op">>=</span> <span class="self">self</span>.<span class="ident">items</span>[<span class="ident">parent</span>].<span class="number">0</span> { |
| <span class="kw">break</span> |
| } |
| <span class="kw">let</span> (<span class="ident">a</span>, <span class="ident">b</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">items</span>.<span class="ident">split_at_mut</span>(<span class="ident">idx</span>); |
| <span class="ident">mem</span>::<span class="ident">swap</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">a</span>[<span class="ident">parent</span>], <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">b</span>[<span class="number">0</span>]); |
| <span class="self">self</span>.<span class="ident">index</span>[<span class="ident">a</span>[<span class="ident">parent</span>].<span class="number">1</span>] <span class="op">=</span> <span class="ident">parent</span>; |
| <span class="self">self</span>.<span class="ident">index</span>[<span class="ident">b</span>[<span class="number">0</span>].<span class="number">1</span>] <span class="op">=</span> <span class="ident">idx</span>; |
| <span class="ident">idx</span> <span class="op">=</span> <span class="ident">parent</span>; |
| } |
| <span class="kw">return</span> <span class="ident">idx</span> |
| } |
| |
| <span class="kw">fn</span> <span class="ident">percolate_down</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">idx</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">usize</span> { |
| <span class="kw">loop</span> { |
| <span class="kw">let</span> <span class="ident">left</span> <span class="op">=</span> <span class="number">2</span> <span class="op">*</span> <span class="ident">idx</span> <span class="op">+</span> <span class="number">1</span>; |
| <span class="kw">let</span> <span class="ident">right</span> <span class="op">=</span> <span class="number">2</span> <span class="op">*</span> <span class="ident">idx</span> <span class="op">+</span> <span class="number">2</span>; |
| |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">swap_left</span> <span class="op">=</span> <span class="bool-val">true</span>; |
| <span class="kw">match</span> (<span class="self">self</span>.<span class="ident">items</span>.<span class="ident">get</span>(<span class="ident">left</span>), <span class="self">self</span>.<span class="ident">items</span>.<span class="ident">get</span>(<span class="ident">right</span>)) { |
| (<span class="prelude-val">Some</span>(<span class="ident">left</span>), <span class="prelude-val">None</span>) <span class="op">=></span> { |
| <span class="kw">if</span> <span class="ident">left</span>.<span class="number">0</span> <span class="op">>=</span> <span class="self">self</span>.<span class="ident">items</span>[<span class="ident">idx</span>].<span class="number">0</span> { |
| <span class="kw">break</span> |
| } |
| } |
| (<span class="prelude-val">Some</span>(<span class="ident">left</span>), <span class="prelude-val">Some</span>(<span class="ident">right</span>)) <span class="op">=></span> { |
| <span class="kw">if</span> <span class="ident">left</span>.<span class="number">0</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">items</span>[<span class="ident">idx</span>].<span class="number">0</span> { |
| <span class="kw">if</span> <span class="ident">right</span>.<span class="number">0</span> <span class="op"><</span> <span class="ident">left</span>.<span class="number">0</span> { |
| <span class="ident">swap_left</span> <span class="op">=</span> <span class="bool-val">false</span>; |
| } |
| } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">right</span>.<span class="number">0</span> <span class="op"><</span> <span class="self">self</span>.<span class="ident">items</span>[<span class="ident">idx</span>].<span class="number">0</span> { |
| <span class="ident">swap_left</span> <span class="op">=</span> <span class="bool-val">false</span>; |
| } <span class="kw">else</span> { |
| <span class="kw">break</span> |
| } |
| } |
| |
| (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) <span class="op">=></span> <span class="kw">break</span>, |
| (<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(<span class="ident">_right</span>)) <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"not possible"</span>), |
| } |
| |
| <span class="kw">let</span> (<span class="ident">a</span>, <span class="ident">b</span>) <span class="op">=</span> <span class="kw">if</span> <span class="ident">swap_left</span> { |
| <span class="self">self</span>.<span class="ident">items</span>.<span class="ident">split_at_mut</span>(<span class="ident">left</span>) |
| } <span class="kw">else</span> { |
| <span class="self">self</span>.<span class="ident">items</span>.<span class="ident">split_at_mut</span>(<span class="ident">right</span>) |
| }; |
| <span class="ident">mem</span>::<span class="ident">swap</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">a</span>[<span class="ident">idx</span>], <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">b</span>[<span class="number">0</span>]); |
| <span class="self">self</span>.<span class="ident">index</span>[<span class="ident">a</span>[<span class="ident">idx</span>].<span class="number">1</span>] <span class="op">=</span> <span class="ident">idx</span>; |
| <span class="self">self</span>.<span class="ident">index</span>[<span class="ident">b</span>[<span class="number">0</span>].<span class="number">1</span>] <span class="op">=</span> <span class="ident">a</span>.<span class="ident">len</span>(); |
| <span class="ident">idx</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">len</span>(); |
| } |
| <span class="kw">return</span> <span class="ident">idx</span> |
| } |
| |
| <span class="kw">fn</span> <span class="ident">assert_consistent</span>(<span class="kw-2">&</span><span class="self">self</span>) { |
| <span class="kw">if</span> <span class="op">!</span><span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">assert_timer_heap_consistent</span>) { |
| <span class="kw">return</span> |
| } |
| |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">items</span>.<span class="ident">len</span>(), <span class="self">self</span>.<span class="ident">index</span>.<span class="ident">len</span>()); |
| |
| <span class="kw">for</span> (<span class="ident">i</span>, <span class="kw-2">&</span>(_, <span class="ident">j</span>)) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">items</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() { |
| <span class="kw">if</span> <span class="self">self</span>.<span class="ident">index</span>[<span class="ident">j</span>] <span class="op">!=</span> <span class="ident">i</span> { |
| <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"self.index[j] != i : i={} j={} self.index[j]={}"</span>, |
| <span class="ident">i</span>, <span class="ident">j</span>, <span class="self">self</span>.<span class="ident">index</span>[<span class="ident">j</span>]); |
| } |
| } |
| |
| <span class="kw">for</span> (<span class="ident">i</span>, <span class="kw-2">&</span>(<span class="kw-2">ref</span> <span class="ident">item</span>, _)) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">items</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() { |
| <span class="kw">if</span> <span class="ident">i</span> <span class="op">></span> <span class="number">0</span> { |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">item</span> <span class="op">>=</span> <span class="self">self</span>.<span class="ident">items</span>[(<span class="ident">i</span> <span class="op">-</span> <span class="number">1</span>) <span class="op">/</span> <span class="number">2</span>].<span class="number">0</span>, <span class="string">"bad at index: {}"</span>, <span class="ident">i</span>); |
| } |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">left</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">items</span>.<span class="ident">get</span>(<span class="number">2</span> <span class="op">*</span> <span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>) { |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">item</span> <span class="op"><=</span> <span class="ident">left</span>.<span class="number">0</span>, <span class="string">"bad left at index: {}"</span>, <span class="ident">i</span>); |
| } |
| <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">right</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">items</span>.<span class="ident">get</span>(<span class="number">2</span> <span class="op">*</span> <span class="ident">i</span> <span class="op">+</span> <span class="number">2</span>) { |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">item</span> <span class="op"><=</span> <span class="ident">right</span>.<span class="number">0</span>, <span class="string">"bad right at index: {}"</span>, <span class="ident">i</span>); |
| } |
| } |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span> |
| <span class="kw">mod</span> <span class="ident">tests</span> { |
| <span class="kw">use</span> <span class="kw">super</span>::<span class="ident">Heap</span>; |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">simple</span>() { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">h</span> <span class="op">=</span> <span class="ident">Heap</span>::<span class="ident">new</span>(); |
| <span class="ident">h</span>.<span class="ident">push</span>(<span class="number">1</span>); |
| <span class="ident">h</span>.<span class="ident">push</span>(<span class="number">2</span>); |
| <span class="ident">h</span>.<span class="ident">push</span>(<span class="number">8</span>); |
| <span class="ident">h</span>.<span class="ident">push</span>(<span class="number">4</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">h</span>.<span class="ident">pop</span>(), <span class="prelude-val">Some</span>(<span class="number">1</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">h</span>.<span class="ident">pop</span>(), <span class="prelude-val">Some</span>(<span class="number">2</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">h</span>.<span class="ident">pop</span>(), <span class="prelude-val">Some</span>(<span class="number">4</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">h</span>.<span class="ident">pop</span>(), <span class="prelude-val">Some</span>(<span class="number">8</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">h</span>.<span class="ident">pop</span>(), <span class="prelude-val">None</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">h</span>.<span class="ident">pop</span>(), <span class="prelude-val">None</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">simple2</span>() { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">h</span> <span class="op">=</span> <span class="ident">Heap</span>::<span class="ident">new</span>(); |
| <span class="ident">h</span>.<span class="ident">push</span>(<span class="number">5</span>); |
| <span class="ident">h</span>.<span class="ident">push</span>(<span class="number">4</span>); |
| <span class="ident">h</span>.<span class="ident">push</span>(<span class="number">3</span>); |
| <span class="ident">h</span>.<span class="ident">push</span>(<span class="number">2</span>); |
| <span class="ident">h</span>.<span class="ident">push</span>(<span class="number">1</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">h</span>.<span class="ident">pop</span>(), <span class="prelude-val">Some</span>(<span class="number">1</span>)); |
| <span class="ident">h</span>.<span class="ident">push</span>(<span class="number">8</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">h</span>.<span class="ident">pop</span>(), <span class="prelude-val">Some</span>(<span class="number">2</span>)); |
| <span class="ident">h</span>.<span class="ident">push</span>(<span class="number">1</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">h</span>.<span class="ident">pop</span>(), <span class="prelude-val">Some</span>(<span class="number">1</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">h</span>.<span class="ident">pop</span>(), <span class="prelude-val">Some</span>(<span class="number">3</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">h</span>.<span class="ident">pop</span>(), <span class="prelude-val">Some</span>(<span class="number">4</span>)); |
| <span class="ident">h</span>.<span class="ident">push</span>(<span class="number">5</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">h</span>.<span class="ident">pop</span>(), <span class="prelude-val">Some</span>(<span class="number">5</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">h</span>.<span class="ident">pop</span>(), <span class="prelude-val">Some</span>(<span class="number">5</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">h</span>.<span class="ident">pop</span>(), <span class="prelude-val">Some</span>(<span class="number">8</span>)); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">remove</span>() { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">h</span> <span class="op">=</span> <span class="ident">Heap</span>::<span class="ident">new</span>(); |
| <span class="ident">h</span>.<span class="ident">push</span>(<span class="number">5</span>); |
| <span class="ident">h</span>.<span class="ident">push</span>(<span class="number">4</span>); |
| <span class="ident">h</span>.<span class="ident">push</span>(<span class="number">3</span>); |
| <span class="kw">let</span> <span class="ident">two</span> <span class="op">=</span> <span class="ident">h</span>.<span class="ident">push</span>(<span class="number">2</span>); |
| <span class="ident">h</span>.<span class="ident">push</span>(<span class="number">1</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">h</span>.<span class="ident">pop</span>(), <span class="prelude-val">Some</span>(<span class="number">1</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">h</span>.<span class="ident">remove</span>(<span class="ident">two</span>), <span class="number">2</span>); |
| <span class="ident">h</span>.<span class="ident">push</span>(<span class="number">1</span>); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">h</span>.<span class="ident">pop</span>(), <span class="prelude-val">Some</span>(<span class="number">1</span>)); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">h</span>.<span class="ident">pop</span>(), <span class="prelude-val">Some</span>(<span class="number">3</span>)); |
| } |
| |
| <span class="kw">fn</span> <span class="ident">vec2heap</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Ord</span><span class="op">></span>(<span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">Heap</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">h</span> <span class="op">=</span> <span class="ident">Heap</span>::<span class="ident">new</span>(); |
| <span class="kw">for</span> <span class="ident">t</span> <span class="kw">in</span> <span class="ident">v</span> { |
| <span class="ident">h</span>.<span class="ident">push</span>(<span class="ident">t</span>); |
| } |
| <span class="kw">return</span> <span class="ident">h</span> |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_peek_and_pop</span>() { |
| <span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">2</span>, <span class="number">4</span>, <span class="number">6</span>, <span class="number">2</span>, <span class="number">1</span>, <span class="number">8</span>, <span class="number">10</span>, <span class="number">3</span>, <span class="number">5</span>, <span class="number">7</span>, <span class="number">0</span>, <span class="number">9</span>, <span class="number">1</span>]; |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">sorted</span> <span class="op">=</span> <span class="ident">data</span>.<span class="ident">clone</span>(); |
| <span class="ident">sorted</span>.<span class="ident">sort</span>(); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">heap</span> <span class="op">=</span> <span class="ident">vec2heap</span>(<span class="ident">data</span>); |
| <span class="kw">while</span> <span class="ident">heap</span>.<span class="ident">peek</span>().<span class="ident">is_some</span>() { |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">heap</span>.<span class="ident">peek</span>().<span class="ident">unwrap</span>(), <span class="ident">sorted</span>.<span class="ident">first</span>().<span class="ident">unwrap</span>()); |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">heap</span>.<span class="ident">pop</span>().<span class="ident">unwrap</span>(), <span class="ident">sorted</span>.<span class="ident">remove</span>(<span class="number">0</span>)); |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_push</span>() { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">heap</span> <span class="op">=</span> <span class="ident">Heap</span>::<span class="ident">new</span>(); |
| <span class="ident">heap</span>.<span class="ident">push</span>(<span class="op">-</span><span class="number">2</span>); |
| <span class="ident">heap</span>.<span class="ident">push</span>(<span class="op">-</span><span class="number">4</span>); |
| <span class="ident">heap</span>.<span class="ident">push</span>(<span class="op">-</span><span class="number">9</span>); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">heap</span>.<span class="ident">peek</span>().<span class="ident">unwrap</span>() <span class="op">==</span> <span class="op">-</span><span class="number">9</span>); |
| <span class="ident">heap</span>.<span class="ident">push</span>(<span class="op">-</span><span class="number">11</span>); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">heap</span>.<span class="ident">peek</span>().<span class="ident">unwrap</span>() <span class="op">==</span> <span class="op">-</span><span class="number">11</span>); |
| <span class="ident">heap</span>.<span class="ident">push</span>(<span class="op">-</span><span class="number">5</span>); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">heap</span>.<span class="ident">peek</span>().<span class="ident">unwrap</span>() <span class="op">==</span> <span class="op">-</span><span class="number">11</span>); |
| <span class="ident">heap</span>.<span class="ident">push</span>(<span class="op">-</span><span class="number">27</span>); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">heap</span>.<span class="ident">peek</span>().<span class="ident">unwrap</span>() <span class="op">==</span> <span class="op">-</span><span class="number">27</span>); |
| <span class="ident">heap</span>.<span class="ident">push</span>(<span class="op">-</span><span class="number">3</span>); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">heap</span>.<span class="ident">peek</span>().<span class="ident">unwrap</span>() <span class="op">==</span> <span class="op">-</span><span class="number">27</span>); |
| <span class="ident">heap</span>.<span class="ident">push</span>(<span class="op">-</span><span class="number">103</span>); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">heap</span>.<span class="ident">peek</span>().<span class="ident">unwrap</span>() <span class="op">==</span> <span class="op">-</span><span class="number">103</span>); |
| } |
| |
| <span class="kw">fn</span> <span class="ident">check_to_vec</span>(<span class="kw-2">mut</span> <span class="ident">data</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span>) { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">heap</span> <span class="op">=</span> <span class="ident">Heap</span>::<span class="ident">new</span>(); |
| <span class="kw">for</span> <span class="ident">data</span> <span class="kw">in</span> <span class="ident">data</span>.<span class="ident">iter</span>() { |
| <span class="ident">heap</span>.<span class="ident">push</span>(<span class="kw-2">*</span><span class="ident">data</span>); |
| } |
| <span class="ident">data</span>.<span class="ident">sort</span>(); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>(); |
| <span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">i</span>) <span class="op">=</span> <span class="ident">heap</span>.<span class="ident">pop</span>() { |
| <span class="ident">v</span>.<span class="ident">push</span>(<span class="ident">i</span>); |
| } |
| <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="ident">data</span>); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_to_vec</span>() { |
| <span class="ident">check_to_vec</span>(<span class="macro">vec</span><span class="macro">!</span>[]); |
| <span class="ident">check_to_vec</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="number">5</span>]); |
| <span class="ident">check_to_vec</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="number">3</span>, <span class="number">2</span>]); |
| <span class="ident">check_to_vec</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="number">2</span>, <span class="number">3</span>]); |
| <span class="ident">check_to_vec</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="number">5</span>, <span class="number">1</span>, <span class="number">2</span>]); |
| <span class="ident">check_to_vec</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">100</span>, <span class="number">2</span>, <span class="number">3</span>]); |
| <span class="ident">check_to_vec</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">3</span>, <span class="number">5</span>, <span class="number">7</span>, <span class="number">9</span>, <span class="number">2</span>, <span class="number">4</span>, <span class="number">6</span>, <span class="number">8</span>, <span class="number">0</span>]); |
| <span class="ident">check_to_vec</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="number">2</span>, <span class="number">4</span>, <span class="number">6</span>, <span class="number">2</span>, <span class="number">1</span>, <span class="number">8</span>, <span class="number">10</span>, <span class="number">3</span>, <span class="number">5</span>, <span class="number">7</span>, <span class="number">0</span>, <span class="number">9</span>, <span class="number">1</span>]); |
| <span class="ident">check_to_vec</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="number">9</span>, <span class="number">11</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">9</span>, <span class="number">11</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">11</span>, <span class="number">9</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>]); |
| <span class="ident">check_to_vec</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>, <span class="number">10</span>]); |
| <span class="ident">check_to_vec</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="number">10</span>, <span class="number">9</span>, <span class="number">8</span>, <span class="number">7</span>, <span class="number">6</span>, <span class="number">5</span>, <span class="number">4</span>, <span class="number">3</span>, <span class="number">2</span>, <span class="number">1</span>, <span class="number">0</span>]); |
| <span class="ident">check_to_vec</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>]); |
| <span class="ident">check_to_vec</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="number">5</span>, <span class="number">4</span>, <span class="number">3</span>, <span class="number">2</span>, <span class="number">1</span>, <span class="number">5</span>, <span class="number">4</span>, <span class="number">3</span>, <span class="number">2</span>, <span class="number">1</span>, <span class="number">5</span>, <span class="number">4</span>, <span class="number">3</span>, <span class="number">2</span>, <span class="number">1</span>]); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_empty_pop</span>() { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">heap</span> <span class="op">=</span> <span class="ident">Heap</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>::<span class="ident">new</span>(); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">heap</span>.<span class="ident">pop</span>().<span class="ident">is_none</span>()); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">test_empty_peek</span>() { |
| <span class="kw">let</span> <span class="ident">empty</span> <span class="op">=</span> <span class="ident">Heap</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>::<span class="ident">new</span>(); |
| <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">empty</span>.<span class="ident">peek</span>().<span class="ident">is_none</span>()); |
| } |
| } |
| </pre> |
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