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80 lines
2.5 KiB
C++
80 lines
2.5 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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// type_traits
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// add_lvalue_reference
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// If T names a referenceable type then the member typedef type
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// shall name T&; otherwise, type shall name T.
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#include <type_traits>
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#include "test_macros.h"
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template <class T, class U>
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void test_add_lvalue_reference()
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{
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static_assert((std::is_same<typename std::add_lvalue_reference<T>::type, U>::value), "");
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#if TEST_STD_VER > 11
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static_assert((std::is_same<std::add_lvalue_reference_t<T>, U>::value), "");
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#endif
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}
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template <class F>
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void test_function0()
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{
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static_assert((std::is_same<typename std::add_lvalue_reference<F>::type, F&>::value), "");
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#if TEST_STD_VER > 11
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static_assert((std::is_same<std::add_lvalue_reference_t<F>, F&>::value), "");
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#endif
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}
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template <class F>
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void test_function1()
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{
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static_assert((std::is_same<typename std::add_lvalue_reference<F>::type, F>::value), "");
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#if TEST_STD_VER > 11
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static_assert((std::is_same<std::add_lvalue_reference_t<F>, F>::value), "");
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#endif
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}
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struct Foo {};
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int main()
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{
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test_add_lvalue_reference<void, void>();
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test_add_lvalue_reference<int, int&>();
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test_add_lvalue_reference<int[3], int(&)[3]>();
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test_add_lvalue_reference<int&, int&>();
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test_add_lvalue_reference<const int&, const int&>();
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test_add_lvalue_reference<int*, int*&>();
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test_add_lvalue_reference<const int*, const int*&>();
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test_add_lvalue_reference<Foo, Foo&>();
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// LWG 2101 specifically talks about add_lvalue_reference and functions.
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// The term of art is "a referenceable type", which a cv- or ref-qualified function is not.
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test_function0<void()>();
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#if TEST_STD_VER >= 11
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test_function1<void() const>();
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test_function1<void() &>();
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test_function1<void() &&>();
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test_function1<void() const &>();
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test_function1<void() const &&>();
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#endif
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// But a cv- or ref-qualified member function *is* "a referenceable type"
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test_function0<void (Foo::*)()>();
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#if TEST_STD_VER >= 11
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test_function0<void (Foo::*)() const>();
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test_function0<void (Foo::*)() &>();
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test_function0<void (Foo::*)() &&>();
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test_function0<void (Foo::*)() const &>();
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test_function0<void (Foo::*)() const &&>();
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#endif
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}
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