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support void_t SFINAE
#feat fix #748
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‎src/lib/AST/ASTVisitor.cpp

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@@ -2242,6 +2242,10 @@ ASTVisitor::getSFINAETemplateInfo(QualType T, bool const AllowDependentNames) co
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T = QualType(DNT->getQualifier()->getAsType(), 0);
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MRDOCS_SYMBOL_TRACE(T, context_);
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}
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if (!T.getTypePtrOrNull())
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{
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return std::nullopt;
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}
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// If the type is a template specialization type, extract the template name
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// and the template arguments

‎test-files/golden-tests/metadata/sfinae.adoc

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@@ -25,6 +25,12 @@
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| <<A-02,`A&lt;T, void&gt;`>>
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| Specialization for floating point types
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| <<S-02,`S`>>
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| SFINAE with std&colon;&colon;void&lowbar;t
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| <<S-08,`S&lt;T, std::void&lowbar;t&lt;T::a::b&gt;&gt;`>>
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| SFINAE with std&colon;&colon;void&lowbar;t
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|===
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=== Functions
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@@ -136,6 +142,94 @@ class <<A-09,A>>&lt;T, void&gt;;
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[#S-02]
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== S
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SFINAE with std&colon;&colon;void&lowbar;t
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=== Synopsis
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Declared in `&lt;sfinae&period;cpp&gt;`
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[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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----
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template&lt;
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class T,
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class = void&gt;
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struct S;
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----
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=== Member Functions
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[cols=1]
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|===
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| Name
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| <<S-02-store,`store`>>
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|===
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[#S-02-store]
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== <<S-02,S>>::store
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=== Synopsis
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Declared in `&lt;sfinae&period;cpp&gt;`
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[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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----
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void
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store(void const*);
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----
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[#S-08]
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== S&lt;T, std::void&lowbar;t&lt;T::a::b&gt;&gt;
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SFINAE with std&colon;&colon;void&lowbar;t
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=== Synopsis
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Declared in `&lt;sfinae&period;cpp&gt;`
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[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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----
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template&lt;class T&gt;
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struct <<S-02,S>>&lt;T, std::void&lowbar;t&lt;T::a::b&gt;&gt;;
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----
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=== Member Functions
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[cols=1]
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|===
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| Name
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| <<S-08-store,`store`>>
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|===
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[#S-08-store]
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== <<S-08,S>>&lt;T, std::void&lowbar;t&lt;T::a::b&gt;&gt;::store
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=== Synopsis
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Declared in `&lt;sfinae&period;cpp&gt;`
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[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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----
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void
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store(void const*);
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----
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[#f1]
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== f1
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‎test-files/golden-tests/metadata/sfinae.cpp

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@@ -71,3 +71,17 @@ class A {};
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/// Specialization for floating point types
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template<class T>
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class A<T, std::enable_if_t<std::is_integral_v<T>>> {};
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/// SFINAE with std::void_t
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template <class T, class = void>
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struct S
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{
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void store(const void*) {}
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};
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/// SFINAE with std::void_t
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template <class T>
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struct S<T, std::void_t<typename T::a::b>>
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{
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void store(const void*) {}
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};

‎test-files/golden-tests/metadata/sfinae.html

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@@ -35,6 +35,12 @@ <h2>Types</h2>
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</td></tr><tr>
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<td><a href="#A-02"><code>A&lt;T, void&gt;</code></a> </td><td><span><span>Specialization for floating point types</span></span>
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</td></tr><tr>
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<td><a href="#S-02"><code>S</code></a> </td><td><span><span>SFINAE with std::void_t</span></span>
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</td></tr><tr>
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<td><a href="#S-08"><code>S&lt;T, std::void_t&lt;T::a::b&gt;&gt;</code></a> </td><td><span><span>SFINAE with std::void_t</span></span>
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</td></tr>
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</tbody>
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</table>
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</div>
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</div>
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<div>
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<div>
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<h2 id="S-02">S</h2>
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<div>
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<span><span>SFINAE with std::void_t</span></span>
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</div>
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</div>
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<div>
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<h3>Synopsis</h3>
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<div>
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Declared in <code>&lt;sfinae.cpp&gt;</code></div>
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<pre>
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<code class="source-code cpp">
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template&lt;
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class T,
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class = void&gt;
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struct S;
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</code>
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</pre>
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</div>
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<h2>Member Functions</h2>
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<table style="table-layout: fixed; width: 100%;">
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<thead>
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<tr>
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<th>Name</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><a href="#S-02-store"><code>store</code></a> </td></tr>
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</tbody>
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</table>
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</div>
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<div>
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<div>
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<h2 id="S-02-store"><a href="#S-02">S</a>::store</h2>
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</div>
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<div>
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<h3>Synopsis</h3>
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<div>
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Declared in <code>&lt;sfinae.cpp&gt;</code></div>
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<pre>
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<code class="source-code cpp">
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void
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store(void const*);
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</code>
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</pre>
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</div>
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</div>
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<div>
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<div>
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<h2 id="S-08">S&lt;T, std::void_t&lt;T::a::b&gt;&gt;</h2>
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<div>
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<span><span>SFINAE with std::void_t</span></span>
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</div>
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</div>
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<div>
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<h3>Synopsis</h3>
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<div>
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Declared in <code>&lt;sfinae.cpp&gt;</code></div>
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<pre>
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<code class="source-code cpp">
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template&lt;class T&gt;
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struct <a href="#S-02">S</a>&lt;T, std::void_t&lt;T::a::b&gt;&gt;;
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</code>
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</pre>
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</div>
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<h2>Member Functions</h2>
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<table style="table-layout: fixed; width: 100%;">
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<thead>
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<tr>
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<th>Name</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><a href="#S-08-store"><code>store</code></a> </td></tr>
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</tbody>
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</table>
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</div>
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<div>
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<div>
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<h2 id="S-08-store"><a href="#S-08">S</a>&lt;T, std::void_t&lt;T::a::b&gt;&gt;::store</h2>
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</div>
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<div>
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<h3>Synopsis</h3>
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<div>
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Declared in <code>&lt;sfinae.cpp&gt;</code></div>
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<pre>
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<code class="source-code cpp">
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void
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store(void const*);
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</code>
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</pre>
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</div>
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</div>
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<div>
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<div>

‎test-files/golden-tests/metadata/sfinae.xml

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</doc>
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</class>
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</template>
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<template>
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<tparam name="T" class="type"/>
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<tparam class="type" default="void"/>
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<struct name="S" id="IZrmVBMJu1uvsP9zur5JVrwgYmE=">
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<file short-path="sfinae.cpp" source-path="sfinae.cpp" line="76" class="def"/>
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<doc>
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<para>
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<text>SFINAE with std::void_t</text>
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</para>
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</doc>
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<function name="store" id="KmwKarrWHSv7aalrBX18hjPbEfs=">
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<file short-path="sfinae.cpp" source-path="sfinae.cpp" line="79" class="def"/>
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<param>
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<type class="pointer">
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<pointee-type name="void" cv-qualifiers="const"/>
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</type>
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</param>
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</function>
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</struct>
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</template>
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<template class="partial" id="IZrmVBMJu1uvsP9zur5JVrwgYmE=">
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<tparam name="T" class="type"/>
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<targ class="type" type="T"/>
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<targ class="type" type="std::void_t&lt;T::a::b&gt;"/>
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<struct name="S" id="g0UNZpdodOU5mGCtcpviXd8o6Vk=">
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<file short-path="sfinae.cpp" source-path="sfinae.cpp" line="84" class="def"/>
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<doc>
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<para>
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<text>SFINAE with std::void_t</text>
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</para>
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</doc>
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<function name="store" id="2KfuSRGlpNo9Lk/lk1bhwZqm/BY=">
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<file short-path="sfinae.cpp" source-path="sfinae.cpp" line="86" class="def"/>
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<param>
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<type class="pointer">
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<pointee-type name="void" cv-qualifiers="const"/>
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</type>
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</param>
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</function>
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</struct>
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</template>
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</namespace>
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</mrdocs>

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