tools/fidl/fidldoc/goldens/union.md.golden - fuchsia - Git at Google

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 [TOC]
 # test.union


 ## **PROTOCOLS**

 ## TestProtocol {#TestProtocol}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=124)*

 ### FlexibleXUnionHenceResponseMustBeHeapAllocated {#TestProtocol.FlexibleXUnionHenceResponseMustBeHeapAllocated}


 #### Request {#TestProtocol.FlexibleXUnionHenceResponseMustBeHeapAllocated_Request}

 &lt;EMPTY&gt;


 #### Response {#TestProtocol.FlexibleXUnionHenceResponseMustBeHeapAllocated_Response}

 <table>
     <tr><th>Name</th><th>Type</th></tr>
         <tr>
             <td><code>xu</code></td>
             <td>
                 <code><a class='link' href='#OlderSimpleUnion'>OlderSimpleUnion</a></code>
             </td>
         </tr>
 </table>

 ### StrictXUnionHenceResponseMayBeStackAllocated {#TestProtocol.StrictXUnionHenceResponseMayBeStackAllocated}


 #### Request {#TestProtocol.StrictXUnionHenceResponseMayBeStackAllocated_Request}

 &lt;EMPTY&gt;


 #### Response {#TestProtocol.StrictXUnionHenceResponseMayBeStackAllocated_Response}

 <table>
     <tr><th>Name</th><th>Type</th></tr>
         <tr>
             <td><code>xu</code></td>
             <td>
                 <code><a class='link' href='#StrictBoundedXUnion'>StrictBoundedXUnion</a></code>
             </td>
         </tr>
 </table>


 ## **STRUCTS**

 ### Empty  {#Empty data-text="Empty"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=113)*

 &lt;EMPTY&gt;

 ### NullableUnionStruct  {#NullableUnionStruct data-text="NullableUnionStruct"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=66)*

 <table>
     <tr><th>Field</th><th>Type</th><th>Description</th><th>Default</th></tr>
         <tr id="NullableUnionStruct.the_union">
             <td><code>the_union</code></td>
             <td>
                 <code><a class='link' href='#Union'>Union</a>?</code>
             </td>
             <td></td>
             <td>No default</td>
         </tr>
 </table>

 ### Pasta  {#Pasta data-text="Pasta"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=7)*

 <table>
     <tr><th>Field</th><th>Type</th><th>Description</th><th>Default</th></tr>
         <tr id="Pasta.sauce">
             <td><code>sauce</code></td>
             <td>
                 <code>string[16]</code>
             </td>
             <td></td>
             <td>No default</td>
         </tr>
 </table>

 ### Pizza  {#Pizza data-text="Pizza"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=3)*

 <table>
     <tr><th>Field</th><th>Type</th><th>Description</th><th>Default</th></tr>
         <tr id="Pizza.toppings">
             <td><code>toppings</code></td>
             <td>
                 <code>vector&lt;string&gt;</code>
             </td>
             <td></td>
             <td>No default</td>
         </tr>
 </table>

 ### StructWithNullableXUnion  {#StructWithNullableXUnion data-text="StructWithNullableXUnion"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=133)*

 <table>
     <tr><th>Field</th><th>Type</th><th>Description</th><th>Default</th></tr>
         <tr id="StructWithNullableXUnion.x1">
             <td><code>x1</code></td>
             <td>
                 <code><a class='link' href='#OlderSimpleUnion'>OlderSimpleUnion</a>?</code>
             </td>
             <td></td>
             <td>No default</td>
         </tr>
 </table>

 ### UnionSandwich  {#UnionSandwich data-text="UnionSandwich"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=144)*

 <table>
     <tr><th>Field</th><th>Type</th><th>Description</th><th>Default</th></tr>
         <tr id="UnionSandwich.a">
             <td><code>a</code></td>
             <td>
                 <code>uint32</code>
             </td>
             <td></td>
             <td>No default</td>
         </tr>
         <tr id="UnionSandwich.u">
             <td><code>u</code></td>
             <td>
                 <code><a class='link' href='#ExplicitXUnion'>ExplicitXUnion</a></code>
             </td>
             <td></td>
             <td>No default</td>
         </tr>
         <tr id="UnionSandwich.b">
             <td><code>b</code></td>
             <td>
                 <code>uint32</code>
             </td>
             <td></td>
             <td>No default</td>
         </tr>
 </table>


 ## **UNIONS**

 ### ExplicitFoo [flexible](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#ExplicitFoo data-text="ExplicitFoo"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=80)*
 <table>
     <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
         <tr id="ExplicitFoo.s">
 <td><h3 id="ExplicitFoo.s" class="add-link hide-from-toc">2</h3></td>
             <td><code>s</code></td>
             <td>
                 <code>string</code>
             </td>
             <td></td>
         </tr>
         <tr id="ExplicitFoo.i">
 <td><h3 id="ExplicitFoo.i" class="add-link hide-from-toc">1</h3></td>
             <td><code>i</code></td>
             <td>
                 <code>int32</code>
             </td>
             <td></td>
         </tr>
         <tr id="ExplicitFoo.">
 <td><h3 id="ExplicitFoo." class="add-link hide-from-toc">3</h3></td>
             <td><code></code></td>
             <td>
                 <code></code>
             </td>
             <td></td>
         </tr>
 </table>

 ### ExplicitPizzaOrPasta [strict](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#ExplicitPizzaOrPasta data-text="ExplicitPizzaOrPasta"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=16)*
 <table>
     <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
         <tr id="ExplicitPizzaOrPasta.">
 <td><h3 id="ExplicitPizzaOrPasta." class="add-link hide-from-toc">3</h3></td>
             <td><code></code></td>
             <td>
                 <code></code>
             </td>
             <td></td>
         </tr>
         <tr id="ExplicitPizzaOrPasta.">
 <td><h3 id="ExplicitPizzaOrPasta." class="add-link hide-from-toc">2</h3></td>
             <td><code></code></td>
             <td>
                 <code></code>
             </td>
             <td></td>
         </tr>
         <tr id="ExplicitPizzaOrPasta.pizza">
 <td><h3 id="ExplicitPizzaOrPasta.pizza" class="add-link hide-from-toc">1</h3></td>
             <td><code>pizza</code></td>
             <td>
                 <code><a class='link' href='#Pizza'>Pizza</a></code>
             </td>
             <td></td>
         </tr>
         <tr id="ExplicitPizzaOrPasta.pasta">
 <td><h3 id="ExplicitPizzaOrPasta.pasta" class="add-link hide-from-toc">4</h3></td>
             <td><code>pasta</code></td>
             <td>
                 <code><a class='link' href='#Pasta'>Pasta</a></code>
             </td>
             <td></td>
         </tr>
 </table>

 ### ExplicitStrictFoo [strict](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#ExplicitStrictFoo data-text="ExplicitStrictFoo"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=86)*
 <table>
     <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
         <tr id="ExplicitStrictFoo.">
 <td><h3 id="ExplicitStrictFoo." class="add-link hide-from-toc">1</h3></td>
             <td><code></code></td>
             <td>
                 <code></code>
             </td>
             <td></td>
         </tr>
         <tr id="ExplicitStrictFoo.s">
 <td><h3 id="ExplicitStrictFoo.s" class="add-link hide-from-toc">3</h3></td>
             <td><code>s</code></td>
             <td>
                 <code>string</code>
             </td>
             <td></td>
         </tr>
         <tr id="ExplicitStrictFoo.i">
 <td><h3 id="ExplicitStrictFoo.i" class="add-link hide-from-toc">2</h3></td>
             <td><code>i</code></td>
             <td>
                 <code>int32</code>
             </td>
             <td></td>
         </tr>
 </table>

 ### ExplicitUnion [strict](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#ExplicitUnion data-text="ExplicitUnion"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=55)*
 <table>
     <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
         <tr id="ExplicitUnion.">
 <td><h3 id="ExplicitUnion." class="add-link hide-from-toc">2</h3></td>
             <td><code></code></td>
             <td>
                 <code></code>
             </td>
             <td></td>
         </tr>
         <tr id="ExplicitUnion.Primitive">
 <td><h3 id="ExplicitUnion.Primitive" class="add-link hide-from-toc">1</h3></td>
             <td><code>Primitive</code></td>
             <td>
                 <code>int32</code>
             </td>
             <td></td>
         </tr>
         <tr id="ExplicitUnion.StringNeedsConstructor">
 <td><h3 id="ExplicitUnion.StringNeedsConstructor" class="add-link hide-from-toc">3</h3></td>
             <td><code>StringNeedsConstructor</code></td>
             <td>
                 <code>string</code>
             </td>
             <td></td>
         </tr>
 </table>

 ### ExplicitXUnion [flexible](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#ExplicitXUnion data-text="ExplicitXUnion"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=137)*
 <table>
     <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
         <tr id="ExplicitXUnion.">
 <td><h3 id="ExplicitXUnion." class="add-link hide-from-toc">3</h3></td>
             <td><code></code></td>
             <td>
                 <code></code>
             </td>
             <td></td>
         </tr>
         <tr id="ExplicitXUnion.">
 <td><h3 id="ExplicitXUnion." class="add-link hide-from-toc">2</h3></td>
             <td><code></code></td>
             <td>
                 <code></code>
             </td>
             <td></td>
         </tr>
         <tr id="ExplicitXUnion.i">
 <td><h3 id="ExplicitXUnion.i" class="add-link hide-from-toc">1</h3></td>
             <td><code>i</code></td>
             <td>
                 <code>int64</code>
             </td>
             <td></td>
         </tr>
         <tr id="ExplicitXUnion.f">
 <td><h3 id="ExplicitXUnion.f" class="add-link hide-from-toc">4</h3></td>
             <td><code>f</code></td>
             <td>
                 <code>float32</code>
             </td>
             <td></td>
         </tr>
 </table>

 ### FieldCollision [strict](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#FieldCollision data-text="FieldCollision"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=51)*
 <table>
     <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
         <tr id="FieldCollision.field_collision_tag">
 <td><h3 id="FieldCollision.field_collision_tag" class="add-link hide-from-toc">1</h3></td>
             <td><code>field_collision_tag</code></td>
             <td>
                 <code>int32</code>
             </td>
             <td></td>
         </tr>
 </table>

 ### FlexibleFoo [flexible](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#FlexibleFoo data-text="FlexibleFoo"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=70)*
 <table>
     <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
         <tr id="FlexibleFoo.s">
 <td><h3 id="FlexibleFoo.s" class="add-link hide-from-toc">1</h3></td>
             <td><code>s</code></td>
             <td>
                 <code>string</code>
             </td>
             <td></td>
         </tr>
         <tr id="FlexibleFoo.i">
 <td><h3 id="FlexibleFoo.i" class="add-link hide-from-toc">2</h3></td>
             <td><code>i</code></td>
             <td>
                 <code>int32</code>
             </td>
             <td></td>
         </tr>
 </table>

 ### FlexiblePizzaOrPasta [flexible](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#FlexiblePizzaOrPasta data-text="FlexiblePizzaOrPasta"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=23)*
 <table>
     <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
         <tr id="FlexiblePizzaOrPasta.pizza">
 <td><h3 id="FlexiblePizzaOrPasta.pizza" class="add-link hide-from-toc">1</h3></td>
             <td><code>pizza</code></td>
             <td>
                 <code><a class='link' href='#Pizza'>Pizza</a></code>
             </td>
             <td></td>
         </tr>
         <tr id="FlexiblePizzaOrPasta.pasta">
 <td><h3 id="FlexiblePizzaOrPasta.pasta" class="add-link hide-from-toc">2</h3></td>
             <td><code>pasta</code></td>
             <td>
                 <code><a class='link' href='#Pasta'>Pasta</a></code>
             </td>
             <td></td>
         </tr>
 </table>

 ### FlexibleUnion [flexible](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#FlexibleUnion data-text="FlexibleUnion"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=39)*
 <table>
     <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
         <tr id="FlexibleUnion.Primitive">
 <td><h3 id="FlexibleUnion.Primitive" class="add-link hide-from-toc">1</h3></td>
             <td><code>Primitive</code></td>
             <td>
                 <code>int32</code>
             </td>
             <td></td>
         </tr>
         <tr id="FlexibleUnion.StringNeedsConstructor">
 <td><h3 id="FlexibleUnion.StringNeedsConstructor" class="add-link hide-from-toc">2</h3></td>
             <td><code>StringNeedsConstructor</code></td>
             <td>
                 <code>string</code>
             </td>
             <td></td>
         </tr>
         <tr id="FlexibleUnion.VectorStringAlsoNeedsConstructor">
 <td><h3 id="FlexibleUnion.VectorStringAlsoNeedsConstructor" class="add-link hide-from-toc">3</h3></td>
             <td><code>VectorStringAlsoNeedsConstructor</code></td>
             <td>
                 <code>vector&lt;string&gt;</code>
             </td>
             <td></td>
         </tr>
 </table>

 ### NewerSimpleUnion [flexible](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#NewerSimpleUnion data-text="NewerSimpleUnion"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=97)*
 <table>
     <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
         <tr id="NewerSimpleUnion.i">
 <td><h3 id="NewerSimpleUnion.i" class="add-link hide-from-toc">1</h3></td>
             <td><code>i</code></td>
             <td>
                 <code>int64</code>
             </td>
             <td></td>
         </tr>
         <tr id="NewerSimpleUnion.s">
 <td><h3 id="NewerSimpleUnion.s" class="add-link hide-from-toc">2</h3></td>
             <td><code>s</code></td>
             <td>
                 <code>string</code>
             </td>
             <td></td>
         </tr>
         <tr id="NewerSimpleUnion.v">
 <td><h3 id="NewerSimpleUnion.v" class="add-link hide-from-toc">3</h3></td>
             <td><code>v</code></td>
             <td>
                 <code>vector&lt;string&gt;</code>
             </td>
             <td></td>
         </tr>
 </table>

 ### OlderSimpleUnion [flexible](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#OlderSimpleUnion data-text="OlderSimpleUnion"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=92)*
 <table>
     <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
         <tr id="OlderSimpleUnion.i">
 <td><h3 id="OlderSimpleUnion.i" class="add-link hide-from-toc">1</h3></td>
             <td><code>i</code></td>
             <td>
                 <code>int64</code>
             </td>
             <td></td>
         </tr>
         <tr id="OlderSimpleUnion.f">
 <td><h3 id="OlderSimpleUnion.f" class="add-link hide-from-toc">2</h3></td>
             <td><code>f</code></td>
             <td>
                 <code>float32</code>
             </td>
             <td></td>
         </tr>
 </table>

 ### PizzaOrPasta [strict](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#PizzaOrPasta data-text="PizzaOrPasta"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=11)*
 <table>
     <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
         <tr id="PizzaOrPasta.pizza">
 <td><h3 id="PizzaOrPasta.pizza" class="add-link hide-from-toc">1</h3></td>
             <td><code>pizza</code></td>
             <td>
                 <code><a class='link' href='#Pizza'>Pizza</a></code>
             </td>
             <td></td>
         </tr>
         <tr id="PizzaOrPasta.pasta">
 <td><h3 id="PizzaOrPasta.pasta" class="add-link hide-from-toc">2</h3></td>
             <td><code>pasta</code></td>
             <td>
                 <code><a class='link' href='#Pasta'>Pasta</a></code>
             </td>
             <td></td>
         </tr>
 </table>

 ### ReverseOrdinalUnion [strict](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#ReverseOrdinalUnion data-text="ReverseOrdinalUnion"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=61)*
 <table>
     <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
         <tr id="ReverseOrdinalUnion.second">
 <td><h3 id="ReverseOrdinalUnion.second" class="add-link hide-from-toc">2</h3></td>
             <td><code>second</code></td>
             <td>
                 <code>uint32</code>
             </td>
             <td></td>
         </tr>
         <tr id="ReverseOrdinalUnion.first">
 <td><h3 id="ReverseOrdinalUnion.first" class="add-link hide-from-toc">1</h3></td>
             <td><code>first</code></td>
             <td>
                 <code>uint32</code>
             </td>
             <td></td>
         </tr>
 </table>

 ### StrictBoundedXUnion [strict](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#StrictBoundedXUnion data-text="StrictBoundedXUnion"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=120)*
 <table>
     <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
         <tr id="StrictBoundedXUnion.v">
 <td><h3 id="StrictBoundedXUnion.v" class="add-link hide-from-toc">1</h3></td>
             <td><code>v</code></td>
             <td>
                 <code>vector&lt;uint8&gt;[10]</code>
             </td>
             <td></td>
         </tr>
 </table>

 ### StrictFoo [strict](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#StrictFoo data-text="StrictFoo"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=75)*
 <table>
     <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
         <tr id="StrictFoo.s">
 <td><h3 id="StrictFoo.s" class="add-link hide-from-toc">1</h3></td>
             <td><code>s</code></td>
             <td>
                 <code>string</code>
             </td>
             <td></td>
         </tr>
         <tr id="StrictFoo.i">
 <td><h3 id="StrictFoo.i" class="add-link hide-from-toc">2</h3></td>
             <td><code>i</code></td>
             <td>
                 <code>int32</code>
             </td>
             <td></td>
         </tr>
 </table>

 ### StrictPizzaOrPasta [strict](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#StrictPizzaOrPasta data-text="StrictPizzaOrPasta"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=28)*
 <table>
     <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
         <tr id="StrictPizzaOrPasta.pizza">
 <td><h3 id="StrictPizzaOrPasta.pizza" class="add-link hide-from-toc">1</h3></td>
             <td><code>pizza</code></td>
             <td>
                 <code><a class='link' href='#Pizza'>Pizza</a></code>
             </td>
             <td></td>
         </tr>
         <tr id="StrictPizzaOrPasta.pasta">
 <td><h3 id="StrictPizzaOrPasta.pasta" class="add-link hide-from-toc">2</h3></td>
             <td><code>pasta</code></td>
             <td>
                 <code><a class='link' href='#Pasta'>Pasta</a></code>
             </td>
             <td></td>
         </tr>
 </table>

 ### StrictSimpleXUnion [strict](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#StrictSimpleXUnion data-text="StrictSimpleXUnion"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=107)*
 <table>
     <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
         <tr id="StrictSimpleXUnion.i">
 <td><h3 id="StrictSimpleXUnion.i" class="add-link hide-from-toc">1</h3></td>
             <td><code>i</code></td>
             <td>
                 <code>int32</code>
             </td>
             <td></td>
         </tr>
         <tr id="StrictSimpleXUnion.f">
 <td><h3 id="StrictSimpleXUnion.f" class="add-link hide-from-toc">2</h3></td>
             <td><code>f</code></td>
             <td>
                 <code>float32</code>
             </td>
             <td></td>
         </tr>
         <tr id="StrictSimpleXUnion.s">
 <td><h3 id="StrictSimpleXUnion.s" class="add-link hide-from-toc">3</h3></td>
             <td><code>s</code></td>
             <td>
                 <code>string</code>
             </td>
             <td></td>
         </tr>
 </table>

 ### StrictUnion [strict](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#StrictUnion data-text="StrictUnion"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=45)*
 <table>
     <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
         <tr id="StrictUnion.Primitive">
 <td><h3 id="StrictUnion.Primitive" class="add-link hide-from-toc">1</h3></td>
             <td><code>Primitive</code></td>
             <td>
                 <code>int32</code>
             </td>
             <td></td>
         </tr>
         <tr id="StrictUnion.StringNeedsConstructor">
 <td><h3 id="StrictUnion.StringNeedsConstructor" class="add-link hide-from-toc">2</h3></td>
             <td><code>StringNeedsConstructor</code></td>
             <td>
                 <code>string</code>
             </td>
             <td></td>
         </tr>
         <tr id="StrictUnion.VectorStringAlsoNeedsConstructor">
 <td><h3 id="StrictUnion.VectorStringAlsoNeedsConstructor" class="add-link hide-from-toc">3</h3></td>
             <td><code>VectorStringAlsoNeedsConstructor</code></td>
             <td>
                 <code>vector&lt;string&gt;</code>
             </td>
             <td></td>
         </tr>
 </table>

 ### Union [strict](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#Union data-text="Union"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=33)*
 <table>
     <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
         <tr id="Union.Primitive">
 <td><h3 id="Union.Primitive" class="add-link hide-from-toc">1</h3></td>
             <td><code>Primitive</code></td>
             <td>
                 <code>int32</code>
             </td>
             <td></td>
         </tr>
         <tr id="Union.StringNeedsConstructor">
 <td><h3 id="Union.StringNeedsConstructor" class="add-link hide-from-toc">2</h3></td>
             <td><code>StringNeedsConstructor</code></td>
             <td>
                 <code>string</code>
             </td>
             <td></td>
         </tr>
         <tr id="Union.VectorStringAlsoNeedsConstructor">
 <td><h3 id="Union.VectorStringAlsoNeedsConstructor" class="add-link hide-from-toc">3</h3></td>
             <td><code>VectorStringAlsoNeedsConstructor</code></td>
             <td>
                 <code>vector&lt;string&gt;</code>
             </td>
             <td></td>
         </tr>
 </table>

 ### UnionWithAttributes [flexible](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#UnionWithAttributes data-text="UnionWithAttributes"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=151)*
 <table>
     <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
         <tr id="UnionWithAttributes.x">
 <td><h3 id="UnionWithAttributes.x" class="add-link hide-from-toc">1</h3></td>
             <td><code>x</code></td>
             <td>
                 <code>int64</code>
             </td>
             <td></td>
         </tr>
         <tr id="UnionWithAttributes.">
 <td><h3 id="UnionWithAttributes." class="add-link hide-from-toc">2</h3></td>
             <td><code></code></td>
             <td>
                 <code></code>
             </td>
             <td></td>
         </tr>
 </table>

 ### XUnionContainingEmptyStruct [flexible](/fuchsia-src/reference/fidl/language/language.md#strict-vs-flexible){:.fidl-attribute}  {#XUnionContainingEmptyStruct data-text="XUnionContainingEmptyStruct"}
 *Defined in [test.union/union.test.fidl](https://cs.opensource.google/fuchsia/fuchsia/+/main:tools/fidl/fidlc/testdata/union.test.fidl;l=115)*
 <table>
     <tr><th>Ordinal</th><th>Variant</th><th>Type</th><th>Description</th></tr>
         <tr id="XUnionContainingEmptyStruct.empty">
 <td><h3 id="XUnionContainingEmptyStruct.empty" class="add-link hide-from-toc">1</h3></td>
             <td><code>empty</code></td>
             <td>
                 <code><a class='link' href='#Empty'>Empty</a></code>
             </td>
             <td></td>
         </tr>
 </table>