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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// type_traits
// template <class T, class... Args>
// struct is_constructible;
#include <type_traits>
#include "test_macros.h"
struct A
{
explicit A(int);
A(int, double);
A(int, long, double);
#if TEST_STD_VER >= 11
private:
#endif
A(char);
};
struct Base {};
struct Derived : public Base {};
class Abstract
{
virtual void foo() = 0;
};
class AbstractDestructor
{
virtual ~AbstractDestructor() = 0;
};
struct PrivateDtor {
PrivateDtor(int) {}
private:
~PrivateDtor() {}
};
struct S {
template <class T>
#if TEST_STD_VER >= 11
explicit
#endif
operator T () const;
};
template <class To>
struct ImplicitTo {
operator To();
};
#if TEST_STD_VER >= 11
template <class To>
struct ExplicitTo {
explicit operator To ();
};
#endif
template <class T>
void test_is_constructible()
{
static_assert( (std::is_constructible<T>::value), "");
#if TEST_STD_VER > 14
static_assert( std::is_constructible_v<T>, "");
#endif
}
template <class T, class A0>
void test_is_constructible()
{
static_assert(( std::is_constructible<T, A0>::value), "");
#if TEST_STD_VER > 14
static_assert(( std::is_constructible_v<T, A0>), "");
#endif
}
template <class T, class A0, class A1>
void test_is_constructible()
{
static_assert(( std::is_constructible<T, A0, A1>::value), "");
#if TEST_STD_VER > 14
static_assert(( std::is_constructible_v<T, A0, A1>), "");
#endif
}
template <class T, class A0, class A1, class A2>
void test_is_constructible()
{
static_assert(( std::is_constructible<T, A0, A1, A2>::value), "");
#if TEST_STD_VER > 14
static_assert(( std::is_constructible_v<T, A0, A1, A2>), "");
#endif
}
template <class T>
void test_is_not_constructible()
{
static_assert((!std::is_constructible<T>::value), "");
#if TEST_STD_VER > 14
static_assert((!std::is_constructible_v<T>), "");
#endif
}
template <class T, class A0>
void test_is_not_constructible()
{
static_assert((!std::is_constructible<T, A0>::value), "");
#if TEST_STD_VER > 14
static_assert((!std::is_constructible_v<T, A0>), "");
#endif
}
int main(int, char**)
{
typedef Base B;
typedef Derived D;
test_is_constructible<int> ();
test_is_constructible<int, const int> ();
test_is_constructible<A, int> ();
test_is_constructible<A, int, double> ();
test_is_constructible<A, int, long, double> ();
test_is_constructible<int&, int&> ();
test_is_not_constructible<A> ();
#if TEST_STD_VER >= 11
test_is_not_constructible<A, char> ();
#else
test_is_constructible<A, char> ();
#endif
test_is_not_constructible<A, void> ();
test_is_not_constructible<int, void()>();
test_is_not_constructible<int, void(&)()>();
test_is_not_constructible<int, void() const>();
test_is_not_constructible<int&, void>();
test_is_not_constructible<int&, void()>();
test_is_not_constructible<int&, void() const>();
test_is_not_constructible<int&, void(&)()>();
test_is_not_constructible<void> ();
test_is_not_constructible<const void> (); // LWG 2738
test_is_not_constructible<volatile void> ();
test_is_not_constructible<const volatile void> ();
test_is_not_constructible<int&> ();
test_is_not_constructible<Abstract> ();
test_is_not_constructible<AbstractDestructor> ();
test_is_constructible<int, S>();
test_is_not_constructible<int&, S>();
test_is_constructible<void(&)(), void(&)()>();
test_is_constructible<void(&)(), void()>();
#if TEST_STD_VER >= 11
test_is_constructible<void(&&)(), void(&&)()>();
test_is_constructible<void(&&)(), void()>();
test_is_constructible<void(&&)(), void(&)()>();
#endif
#if TEST_STD_VER >= 11
test_is_constructible<int const&, int>();
test_is_constructible<int const&, int&&>();
test_is_constructible<int&&, double&>();
test_is_constructible<void(&)(), void(&&)()>();
test_is_not_constructible<int&, int>();
test_is_not_constructible<int&, int const&>();
test_is_not_constructible<int&, int&&>();
test_is_constructible<int&&, int>();
test_is_constructible<int&&, int&&>();
test_is_not_constructible<int&&, int&>();
test_is_not_constructible<int&&, int const&&>();
test_is_constructible<Base, Derived>();
test_is_constructible<Base&, Derived&>();
test_is_not_constructible<Derived&, Base&>();
test_is_constructible<Base const&, Derived const&>();
#ifndef TEST_COMPILER_GCC
test_is_not_constructible<Derived const&, Base const&>();
test_is_not_constructible<Derived const&, Base>();
#endif
test_is_constructible<Base&&, Derived>();
test_is_constructible<Base&&, Derived&&>();
#ifndef TEST_COMPILER_GCC
test_is_not_constructible<Derived&&, Base&&>();
test_is_not_constructible<Derived&&, Base>();
#endif
// test that T must also be destructible
test_is_constructible<PrivateDtor&, PrivateDtor&>();
test_is_not_constructible<PrivateDtor, int>();
test_is_not_constructible<void() const, void() const>();
test_is_not_constructible<void() const, void*>();
test_is_constructible<int&, ImplicitTo<int&>>();
test_is_constructible<const int&, ImplicitTo<int&&>>();
test_is_constructible<int&&, ImplicitTo<int&&>>();
test_is_constructible<const int&, ImplicitTo<int>>();
test_is_not_constructible<B&&, B&>();
test_is_not_constructible<B&&, D&>();
test_is_constructible<B&&, ImplicitTo<D&&>>();
test_is_constructible<B&&, ImplicitTo<D&&>&>();
test_is_constructible<int&&, double&>();
test_is_constructible<const int&, ImplicitTo<int&>&>();
test_is_constructible<const int&, ImplicitTo<int&>>();
test_is_constructible<const int&, ExplicitTo<int&>&>();
test_is_constructible<const int&, ExplicitTo<int&>>();
test_is_constructible<const int&, ExplicitTo<int&>&>();
test_is_constructible<const int&, ExplicitTo<int&>>();
// Binding through reference-compatible type is required to perform
// direct-initialization as described in [over.match.ref] p. 1 b. 1:
//
// But the rvalue to lvalue reference binding isn't allowed according to
// [over.match.ref] despite Clang accepting it.
test_is_constructible<int&, ExplicitTo<int&>>();
#ifndef TEST_COMPILER_GCC
test_is_constructible<const int&, ExplicitTo<int&&>>();
#endif
static_assert(std::is_constructible<int&&, ExplicitTo<int&&>>::value, "");
#ifdef __clang__
// FIXME Clang and GCC disagree on the validity of this expression.
test_is_constructible<const int&, ExplicitTo<int>>();
static_assert(std::is_constructible<int&&, ExplicitTo<int>>::value, "");
#else
test_is_not_constructible<const int&, ExplicitTo<int>>();
test_is_not_constructible<int&&, ExplicitTo<int>>();
#endif
// Binding through temporary behaves like copy-initialization,
// see [dcl.init.ref] p. 5, very last sub-bullet:
test_is_not_constructible<const int&, ExplicitTo<double&&>>();
test_is_not_constructible<int&&, ExplicitTo<double&&>>();
test_is_not_constructible<void()>();
test_is_not_constructible<void() const> ();
test_is_not_constructible<void() volatile> ();
test_is_not_constructible<void() &> ();
test_is_not_constructible<void() &&> ();
#endif // TEST_STD_VER >= 11
return 0;
}
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