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Remove dependency on type_traits

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This commit is contained in:
Peter Dimov
2018-09-17 03:21:42 +03:00
parent 041678752b
commit a9e56e1a6a
1 changed files with 21 additions and 6 deletions
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27
include/boost/system/error_code.hpp
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@ -12,7 +12,6 @@
#include <boost/system/api_config.hpp> #include <boost/system/api_config.hpp>
#include <boost/system/detail/config.hpp> #include <boost/system/detail/config.hpp>
#include <boost/type_traits/enable_if.hpp>
#include <boost/cstdint.hpp> #include <boost/cstdint.hpp>
#include <boost/config.hpp> #include <boost/config.hpp>
#include <ostream> #include <ostream>
@ -355,6 +354,22 @@ static const error_category & native_ecat BOOST_ATTRIBUTE_UNUSED = system_catego
#endif #endif
// enable_if
namespace detail
{
template<bool C, class T = void> struct enable_if
{
typedef T type;
};
template<class T> struct enable_if<false, T>
{
};
} // namespace detail
// class error_condition // class error_condition
// error_conditions are portable, error_codes are system or library specific // error_conditions are portable, error_codes are system or library specific
@ -379,7 +394,7 @@ public:
} }
template<class ErrorConditionEnum> BOOST_SYSTEM_CONSTEXPR error_condition( ErrorConditionEnum e, template<class ErrorConditionEnum> BOOST_SYSTEM_CONSTEXPR error_condition( ErrorConditionEnum e,
typename boost::enable_if_<is_error_condition_enum<ErrorConditionEnum>::value>::type* = 0) BOOST_NOEXCEPT typename detail::enable_if<is_error_condition_enum<ErrorConditionEnum>::value>::type* = 0) BOOST_NOEXCEPT
{ {
*this = make_error_condition( e ); *this = make_error_condition( e );
} }
@ -393,7 +408,7 @@ public:
} }
template<typename ErrorConditionEnum> template<typename ErrorConditionEnum>
BOOST_SYSTEM_CONSTEXPR typename boost::enable_if_<is_error_condition_enum<ErrorConditionEnum>::value, error_condition>::type & BOOST_SYSTEM_CONSTEXPR typename detail::enable_if<is_error_condition_enum<ErrorConditionEnum>::value, error_condition>::type &
operator=( ErrorConditionEnum val ) BOOST_NOEXCEPT operator=( ErrorConditionEnum val ) BOOST_NOEXCEPT
{ {
*this = make_error_condition( val ); *this = make_error_condition( val );
@ -499,8 +514,8 @@ public:
{ {
} }
template <class ErrorCodeEnum> BOOST_SYSTEM_CONSTEXPR error_code( ErrorCodeEnum e, template<class ErrorCodeEnum> BOOST_SYSTEM_CONSTEXPR error_code( ErrorCodeEnum e,
typename boost::enable_if_<is_error_code_enum<ErrorCodeEnum>::value>::type* = 0 ) BOOST_NOEXCEPT typename detail::enable_if<is_error_code_enum<ErrorCodeEnum>::value>::type* = 0 ) BOOST_NOEXCEPT
{ {
*this = make_error_code( e ); *this = make_error_code( e );
} }
@ -514,7 +529,7 @@ public:
} }
template<typename ErrorCodeEnum> template<typename ErrorCodeEnum>
BOOST_SYSTEM_CONSTEXPR typename boost::enable_if_<is_error_code_enum<ErrorCodeEnum>::value, error_code>::type & BOOST_SYSTEM_CONSTEXPR typename detail::enable_if<is_error_code_enum<ErrorCodeEnum>::value, error_code>::type &
operator=( ErrorCodeEnum val ) BOOST_NOEXCEPT operator=( ErrorCodeEnum val ) BOOST_NOEXCEPT
{ {
*this = make_error_code( val ); *this = make_error_code( val );