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