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| </pre><div class="example-wrap"><pre class="rust "> |
| <span class="doccomment">//! Macros to ease conditional code based on enabled features.</span> |
| |
| <span class="comment">// Depending on the features not all macros are used.</span> |
| <span class="attribute">#![<span class="ident">allow</span>(<span class="ident">unused_macros</span>)]</span> |
| |
| <span class="doccomment">/// The `os-poll` feature is enabled.</span> |
| <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">cfg_os_poll</span> { |
| ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">item</span>:<span class="ident">item</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> { |
| $( |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"os-poll"</span>)]</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">docsrs</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"os-poll"</span>)))]</span> |
| <span class="macro-nonterminal">$</span><span class="macro-nonterminal">item</span> |
| )<span class="op">*</span> |
| } |
| } |
| |
| <span class="doccomment">/// The `os-poll` feature is disabled.</span> |
| <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">cfg_not_os_poll</span> { |
| ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">item</span>:<span class="ident">item</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> { |
| $( |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"os-poll"</span>))]</span> |
| <span class="macro-nonterminal">$</span><span class="macro-nonterminal">item</span> |
| )<span class="op">*</span> |
| } |
| } |
| |
| <span class="doccomment">/// The `os-ext` feature is enabled.</span> |
| <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">cfg_os_ext</span> { |
| ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">item</span>:<span class="ident">item</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> { |
| $( |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"os-ext"</span>)]</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">docsrs</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"os-ext"</span>)))]</span> |
| <span class="macro-nonterminal">$</span><span class="macro-nonterminal">item</span> |
| )<span class="op">*</span> |
| } |
| } |
| |
| <span class="doccomment">/// The `net` feature is enabled.</span> |
| <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">cfg_net</span> { |
| ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">item</span>:<span class="ident">item</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> { |
| $( |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"net"</span>)]</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">docsrs</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"net"</span>)))]</span> |
| <span class="macro-nonterminal">$</span><span class="macro-nonterminal">item</span> |
| )<span class="op">*</span> |
| } |
| } |
| |
| <span class="doccomment">/// One of the features enabled that needs `IoSource`. That is `net` or `os-ext`</span> |
| <span class="doccomment">/// on Unix (for `pipe`).</span> |
| <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">cfg_io_source</span> { |
| ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">item</span>:<span class="ident">item</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> { |
| $( |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"net"</span>, <span class="ident">all</span>(<span class="ident">unix</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"os-ext"</span>)))]</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">docsrs</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"net"</span>, <span class="ident">all</span>(<span class="ident">unix</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"os-ext"</span>)))))]</span> |
| <span class="macro-nonterminal">$</span><span class="macro-nonterminal">item</span> |
| )<span class="op">*</span> |
| } |
| } |
| |
| <span class="doccomment">/// The `os-ext` feature is enabled, or one of the features that need `os-ext`.</span> |
| <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">cfg_any_os_ext</span> { |
| ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">item</span>:<span class="ident">item</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> { |
| $( |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"os-ext"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"net"</span>))]</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">docsrs</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"os-ext"</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">"net"</span>))))]</span> |
| <span class="macro-nonterminal">$</span><span class="macro-nonterminal">item</span> |
| )<span class="op">*</span> |
| } |
| } |
| </pre></div> |
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