0b6a182c
 Hu Chunming
添加无鉴权注册和注销
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// Boost.Units - A C++ library for zero-overhead dimensional analysis and
// unit/quantity manipulation and conversion
//
// Copyright (C) 2003-2008 Matthias Christian Schabel
// Copyright (C) 2008 Steven Watanabe
//
// 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_UNITS_STATIC_CONSTANT_HPP
#define BOOST_UNITS_STATIC_CONSTANT_HPP
#include <boost/units/config.hpp>
#if defined(BOOST_NO_CXX11_CONSTEXPR) || defined(BOOST_UNITS_DOXYGEN)
/// A convenience macro that allows definition of static
/// constants in headers in an ODR-safe way.
# define BOOST_UNITS_STATIC_CONSTANT(name, type) \
template<bool b> \
struct name##_instance_t \
{ \
static const type instance; \
}; \
\
namespace \
{ \
static const type& name = name##_instance_t<true>::instance; \
} \
\
template<bool b> \
const type name##_instance_t<b>::instance
#else
# define BOOST_UNITS_STATIC_CONSTANT(name, type) \
BOOST_STATIC_CONSTEXPR type name
#endif
/// A convenience macro for static constants with auto
/// type deduction.
#if BOOST_UNITS_HAS_TYPEOF
#if BOOST_UNITS_HAS_BOOST_TYPEOF
#define BOOST_UNITS_AUTO_STATIC_CONSTANT(name, value) \
BOOST_TYPEOF_NESTED_TYPEDEF(name##_nested_t, value) \
BOOST_UNITS_STATIC_CONSTANT(name, name##_nested_t::type) = (value)
#elif BOOST_UNITS_HAS_MWERKS_TYPEOF
#define BOOST_UNITS_AUTO_STATIC_CONSTANT(name, value) \
BOOST_UNITS_STATIC_CONSTANT(name, __typeof__(value)) = (value)
#elif BOOST_UNITS_HAS_GNU_TYPEOF
#define BOOST_UNITS_AUTO_STATIC_CONSTANT(name, value) \
BOOST_UNITS_STATIC_CONSTANT(name, typeof(value)) = (value)
#endif // BOOST_UNITS_HAS_BOOST_TYPEOF
#endif // BOOST_UNITS_HAS_TYPEOF
#endif // BOOST_UNITS_STATIC_CONSTANT_HPP
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