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Small improvements to make_void:

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* When there are no variadic templates, supports up to 5 parameters.
* Tests added for void_t.
* Documentation added on compiler support.
This commit is contained in:
jzmaddock
2017-02-07 18:49:33 +00:00
parent f59467e310
commit 7b29d67a3e
19 changed files with 42 additions and 23 deletions
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1
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<dt><span class="section"><a href="reference/is_volatile.html">is_volatile</a></span></dt>
<dt><span class="section"><a href="reference/make_signed.html">make_signed</a></span></dt>
<dt><span class="section"><a href="reference/make_unsigned.html">make_unsigned</a></span></dt>
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doc/html/boost_typetraits/reference/remove_all_extents.html
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or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
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<a name="boost_typetraits.reference.remove_all_extents.examples"></a><p class="title"><b>Table&#160;1.26.&#160;Examples</b></p>
<a name="boost_typetraits.reference.remove_all_extents.examples"></a><p class="title"><b>Table&#160;1.27.&#160;Examples</b></p>
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or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
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<a name="boost_typetraits.reference.remove_const.examples"></a><p class="title"><b>Table&#160;1.28.&#160;Examples</b></p>
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<col>

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or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
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<a name="boost_typetraits.reference.remove_cv.examples"></a><p class="title"><b>Table&#160;1.28.&#160;Examples</b></p>
<a name="boost_typetraits.reference.remove_cv.examples"></a><p class="title"><b>Table&#160;1.29.&#160;Examples</b></p>
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doc/html/boost_typetraits/reference/remove_extent.html
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or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
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<a name="boost_typetraits.reference.remove_extent.examples"></a><p class="title"><b>Table&#160;1.29.&#160;Examples</b></p>
<a name="boost_typetraits.reference.remove_extent.examples"></a><p class="title"><b>Table&#160;1.30.&#160;Examples</b></p>
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or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
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<a name="boost_typetraits.reference.remove_pointer.examples"></a><p class="title"><b>Table&#160;1.30.&#160;Examples</b></p>
<a name="boost_typetraits.reference.remove_pointer.examples"></a><p class="title"><b>Table&#160;1.31.&#160;Examples</b></p>
<div class="table-contents"><table class="table" summary="Examples">
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or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
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<div class="table">
<a name="boost_typetraits.reference.remove_reference.examples"></a><p class="title"><b>Table&#160;1.31.&#160;Examples</b></p>
<a name="boost_typetraits.reference.remove_reference.examples"></a><p class="title"><b>Table&#160;1.32.&#160;Examples</b></p>
<div class="table-contents"><table class="table" summary="Examples">
<colgroup>
<col>

2
doc/html/boost_typetraits/reference/remove_volatile.html
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@ -49,7 +49,7 @@
or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
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<div class="table">
<a name="boost_typetraits.reference.remove_volatile.examples"></a><p class="title"><b>Table&#160;1.32.&#160;Examples</b></p>
<a name="boost_typetraits.reference.remove_volatile.examples"></a><p class="title"><b>Table&#160;1.33.&#160;Examples</b></p>
<div class="table-contents"><table class="table" summary="Examples">
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or <code class="computeroutput"> <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">type_traits</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
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<a name="boost_typetraits.reference.type_identity.examples"></a><p class="title"><b>Table&#160;1.33.&#160;Examples</b></p>
<a name="boost_typetraits.reference.type_identity.examples"></a><p class="title"><b>Table&#160;1.34.&#160;Examples</b></p>
<div class="table-contents"><table class="table" summary="Examples">
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doc/html/index.html
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<dt><span class="section"><a href="boost_typetraits/reference/is_volatile.html">is_volatile</a></span></dt>
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@ -292,6 +292,7 @@
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@ -23,7 +23,7 @@
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@ -839,6 +839,7 @@
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doc/make_void.qbk
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@ -42,6 +42,7 @@ __header ` #include <boost/type_traits/make_void.hpp>` or ` #include <boost/type
]
[all_compilers]
[all_compilers] However, the type alias `void_t` is only available if the compiler supports template aliases.
Further, in the absence of variadic-template support, `make_void` only supports up to 5 parameters.
[endsect]

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include/boost/type_traits/make_void.hpp
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@ -24,8 +24,10 @@ struct make_void {
template<class... Ts>
using void_t = typename make_void<Ts...>::type;
#endif
#else
template<class>
#else // BOOST_NO_CXX11_VARIADIC_TEMPLATES
template<class T = void, class U = void, class V = void, class X = void, class Y = void>
struct make_void {
typedef void type;
};
@ -34,6 +36,7 @@ struct make_void {
template<class T>
using void_t = typename make_void<T>::type;
#endif
#endif
} /* boost */

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test/make_void_test.cpp
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@ -26,9 +26,20 @@ BOOST_CHECK_TYPE(::tt::make_void<int(*)(int)>::type, void);
BOOST_CHECK_TYPE(::tt::make_void<int[]>::type, void);
BOOST_CHECK_TYPE(::tt::make_void<int[1]>::type, void);
#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)
BOOST_CHECK_TYPE(::tt::make_void<>::type, void);
BOOST_CHECK_TYPE3(::tt::make_void<int, int>::type, void);
#ifndef BOOST_NO_CXX11_TEMPLATE_ALIASES
BOOST_CHECK_TYPE(::tt::void_t<int>, void);
BOOST_CHECK_TYPE(::tt::void_t<const volatile int>, void);
BOOST_CHECK_TYPE(::tt::void_t<int&>, void);
BOOST_CHECK_TYPE(::tt::void_t<void>, void);
BOOST_CHECK_TYPE(::tt::void_t<int(*)(int)>, void);
BOOST_CHECK_TYPE(::tt::void_t<int[]>, void);
BOOST_CHECK_TYPE(::tt::void_t<int[1]>, void);
BOOST_CHECK_TYPE(::tt::void_t<>, void);
BOOST_CHECK_TYPE3(::tt::void_t<int, int>, void);
#endif
TT_TEST_END