Edit: /usr/include/boost/proto/literal.hpp (3496B)
///////////////////////////////////////////////////////////////////////////////
/// \file literal.hpp
/// The literal\<\> terminal wrapper, and the proto::lit() function for
/// creating literal\<\> wrappers.
//
// Copyright 2008 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PROTO_LITERAL_HPP_EAN_01_03_2007
#define BOOST_PROTO_LITERAL_HPP_EAN_01_03_2007
#include
#include
#include
#include
#include
namespace boost { namespace proto
{
namespace utility
{
/// \brief A simple wrapper for a terminal, provided for
/// ease of use.
///
/// A simple wrapper for a terminal, provided for
/// ease of use. In all cases, literal\ l(x);
/// is equivalent to terminal\::type l = {x};.
///
/// The \c Domain template parameter defaults to
/// \c proto::default_domain.
template<
typename T
, typename Domain // = default_domain
>
struct literal
: extends, 0>, literal, Domain>
{
private:
typedef basic_expr, 0> terminal_type;
typedef extends, Domain> base_type;
typedef literal literal_t;
public:
typedef typename detail::term_traits::value_type value_type;
typedef typename detail::term_traits::reference reference;
typedef typename detail::term_traits::const_reference const_reference;
literal()
: base_type(terminal_type::make(T()))
{}
#ifndef BOOST_NO_CXX11_DEFAULTED_FUNCTIONS
literal(literal const &) = default;
#endif
template
literal(U &u)
: base_type(terminal_type::make(u))
{}
template
literal(U const &u)
: base_type(terminal_type::make(u))
{}
template
literal(literal const &u)
: base_type(terminal_type::make(u.get()))
{}
BOOST_PROTO_EXTENDS_USING_ASSIGN(literal_t)
reference get()
{
return proto::value(*this);
}
const_reference get() const
{
return proto::value(*this);
}
};
}
/// \brief A helper function for creating a \c literal\<\> wrapper.
/// \param t The object to wrap.
/// \return literal\(t)
/// \attention The returned value holds the argument by reference.
/// \throw nothrow
template
inline literal const lit(T &t)
{
return literal(t);
}
/// \overload
///
template
inline literal const lit(T const &t)
{
#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable: 4180) // warning C4180: qualifier applied to function type has no meaning; ignored
#endif
return literal(t);
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
}
}}
#endif