test/std/utilities/meta/meta.unary/meta.unary.prop/is_nothrow_constructible.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// type_traits

// template <class T, class... Args>
//   struct is_nothrow_constructible;

#include <type_traits>

template <class T>
void test_is_nothrow_constructible()
{
    static_assert(( std::is_nothrow_constructible<T>::value), "");
}

template <class T, class A0>
void test_is_nothrow_constructible()
{
    static_assert(( std::is_nothrow_constructible<T, A0>::value), "");
}

template <class T>
void test_is_not_nothrow_constructible()
{
    static_assert((!std::is_nothrow_constructible<T>::value), "");
}

template <class T, class A0>
void test_is_not_nothrow_constructible()
{
    static_assert((!std::is_nothrow_constructible<T, A0>::value), "");
}

template <class T, class A0, class A1>
void test_is_not_nothrow_constructible()
{
    static_assert((!std::is_nothrow_constructible<T, A0, A1>::value), "");
}

class Empty
{
};

class NotEmpty
{
    virtual ~NotEmpty();
};

union Union {};

struct bit_zero
{
    int :  0;
};

class Abstract
{
    virtual ~Abstract() = 0;
};

struct A
{
    A(const A&);
};

struct C
{
    C(C&);  // not const
    void operator=(C&);  // not const
};

#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
struct Tuple {
    Tuple(Empty&&) noexcept {}
};
#endif

int main()
{
    test_is_nothrow_constructible<int> ();
    test_is_nothrow_constructible<int, const int&> ();
    test_is_nothrow_constructible<Empty> ();
    test_is_nothrow_constructible<Empty, const Empty&> ();
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
    test_is_nothrow_constructible<Tuple &&, Empty> (); // See bug #19616.
#endif
    
    test_is_not_nothrow_constructible<A, int> ();
    test_is_not_nothrow_constructible<A, int, double> ();
    test_is_not_nothrow_constructible<A> ();
    test_is_not_nothrow_constructible<C> ();
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
    static_assert(!std::is_constructible<Tuple&, Empty>::value, "");
    test_is_not_nothrow_constructible<Tuple &, Empty> (); // See bug #19616.
#endif
}