boost/scope/detail/is_nonnull_default_constructible.hpp
/*
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* https://www.boost.org/LICENSE_1_0.txt)
*
* Copyright (c) 2023 Andrey Semashev
*/
/*!
* \file scope/detail/is_nonnull_default_constructible.hpp
*
* This header contains definition of \c is_nonnull_default_constructible
* and \c is_nothrow_nonnull_default_constructible type traits. The type
* traits are useful for preventing default-construction of pointers to
* functions where a default-constructed function object is expected.
* Without it, default- or value-constructing a pointer to function would
* produce a function object that is not callable.
*/
#ifndef BOOST_SCOPE_DETAIL_IS_NONNULL_DEFAULT_CONSTRUCTIBLE_HPP_INCLUDED_
#define BOOST_SCOPE_DETAIL_IS_NONNULL_DEFAULT_CONSTRUCTIBLE_HPP_INCLUDED_
#include <type_traits>
#include <boost/scope/detail/config.hpp>
#include <boost/scope/detail/header.hpp>
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
namespace boost {
namespace scope {
namespace detail {
//! The type trait checks if \c T is not a pointer and is default-constructible
template< typename T >
struct is_nonnull_default_constructible :
public std::is_default_constructible< T >
{
};
template< typename T >
struct is_nonnull_default_constructible< T* > :
public std::false_type
{
};
//! The type trait checks if \c T is not a pointer and is nothrow-default-constructible
template< typename T >
struct is_nothrow_nonnull_default_constructible :
public std::is_nothrow_default_constructible< T >
{
};
template< typename T >
struct is_nothrow_nonnull_default_constructible< T* > :
public std::false_type
{
};
} // namespace detail
} // namespace scope
} // namespace boost
#include <boost/scope/detail/footer.hpp>
#endif // BOOST_SCOPE_DETAIL_IS_NONNULL_DEFAULT_CONSTRUCTIBLE_HPP_INCLUDED_