b64f8b07c1
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@119395 91177308-0d34-0410-b5e6-96231b3b80d8
79 lines
3.0 KiB
C++
79 lines
3.0 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <functional>
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// reference_wrapper
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// check for deriving from unary_function
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#include <functional>
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#include <type_traits>
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class functor1
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: public std::unary_function<int, char>
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{
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};
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class functor2
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: public std::binary_function<char, int, double>
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{
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};
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class functor3
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: public std::unary_function<int, int>,
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public std::binary_function<char, int, double>
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{
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public:
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typedef float result_type;
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};
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class functor4
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: public std::unary_function<int, int>,
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public std::binary_function<char, int, double>
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{
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public:
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};
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struct C
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{
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typedef int argument_type;
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typedef int result_type;
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};
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int main()
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{
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static_assert((std::is_base_of<std::unary_function<int, char>,
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std::reference_wrapper<functor1> >::value), "");
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static_assert((!std::is_base_of<std::unary_function<char, int>,
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std::reference_wrapper<functor2> >::value), "");
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static_assert((std::is_base_of<std::unary_function<int, int>,
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std::reference_wrapper<functor3> >::value), "");
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static_assert((std::is_base_of<std::unary_function<int, int>,
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std::reference_wrapper<functor4> >::value), "");
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static_assert((!std::is_base_of<std::unary_function<int, int>,
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std::reference_wrapper<C> >::value), "");
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static_assert((!std::is_base_of<std::unary_function<int, float>,
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std::reference_wrapper<float(*)()> >::value), "");
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static_assert((std::is_base_of<std::unary_function<int, float>,
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std::reference_wrapper<float (int)> >::value), "");
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static_assert((!std::is_base_of<std::unary_function<int, float>,
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std::reference_wrapper<float (int, int)> >::value), "");
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static_assert((std::is_base_of<std::unary_function<int, float>,
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std::reference_wrapper<float(*)(int)> >::value), "");
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static_assert((!std::is_base_of<std::unary_function<int, float>,
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std::reference_wrapper<float(*)(int, int)> >::value), "");
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static_assert((std::is_base_of<std::unary_function<C*, float>,
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std::reference_wrapper<float(C::*)()> >::value), "");
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static_assert((std::is_base_of<std::unary_function<const volatile C*, float>,
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std::reference_wrapper<float(C::*)() const volatile> >::value), "");
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static_assert((!std::is_base_of<std::unary_function<C*, float>,
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std::reference_wrapper<float(C::*)(int)> >::value), "");
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}
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