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Improved workarounds.

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[SVN r21157]
This commit is contained in:
Eric Friedman 2003-12-06 03:57:54 +00:00
parent f3f879555a
commit be43ba1569
1 changed files with 29 additions and 27 deletions
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56
include/boost/utility/enable_if.hpp
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@ -14,8 +14,7 @@
#ifndef BOOST_UTILITY_ENABLE_IF_HPP
#define BOOST_UTILITY_ENABLE_IF_HPP
#include <boost/config.hpp>
#include <boost/static_assert.hpp>
#include "boost/config.hpp"
// Even the definition of enable_if causes problems on some compilers,
// so it's macroed out for all compilers that do not support SFINAE
@ -76,39 +75,42 @@ namespace boost
namespace boost {
BOOST_STATIC_CONSTANT(bool, enable_if_does_not_work_on_this_compiler = false);
namespace detail { typedef void enable_if_default_T; }
template <bool B, class T = void>
struct enable_if_c
{ BOOST_STATIC_ASSERT(enable_if_does_not_work_on_this_compiler); };
template <typename T>
struct enable_if_does_not_work_on_this_compiler;
template <bool B, class T = void>
struct disable_if_c
{ BOOST_STATIC_ASSERT(enable_if_does_not_work_on_this_compiler); };
template <bool B, class T = detail::enable_if_default_T>
struct enable_if_c : enable_if_does_not_work_on_this_compiler<T>
{ };
template <bool B, class T = void>
struct lazy_enable_if_c
{ BOOST_STATIC_ASSERT(enable_if_does_not_work_on_this_compiler); };
template <bool B, class T = detail::enable_if_default_T>
struct disable_if_c : enable_if_does_not_work_on_this_compiler<T>
{ };
template <bool B, class T = void>
struct lazy_disable_if_c
{ BOOST_STATIC_ASSERT(enable_if_does_not_work_on_this_compiler); };
template <bool B, class T = detail::enable_if_default_T>
struct lazy_enable_if_c : enable_if_does_not_work_on_this_compiler<T>
{ };
template <class Cond, class T = void>
struct enable_if
{ BOOST_STATIC_ASSERT(enable_if_does_not_work_on_this_compiler); };
template <bool B, class T = detail::enable_if_default_T>
struct lazy_disable_if_c : enable_if_does_not_work_on_this_compiler<T>
{ };
template <class Cond, class T = void>
struct disable_if
{ BOOST_STATIC_ASSERT(enable_if_does_not_work_on_this_compiler); };
template <class Cond, class T = detail::enable_if_default_T>
struct enable_if : enable_if_does_not_work_on_this_compiler<T>
{ };
template <class Cond, class T = void>
struct lazy_enable_if
{ BOOST_STATIC_ASSERT(enable_if_does_not_work_on_this_compiler); };
template <class Cond, class T = detail::enable_if_default_T>
struct disable_if : enable_if_does_not_work_on_this_compiler<T>
{ };
template <class Cond, class T = void>
struct lazy_disable_if
{ BOOST_STATIC_ASSERT(enable_if_does_not_work_on_this_compiler); };
template <class Cond, class T = detail::enable_if_default_T>
struct lazy_enable_if : enable_if_does_not_work_on_this_compiler<T>
{ };
template <class Cond, class T = detail::enable_if_default_T>
struct lazy_disable_if : enable_if_does_not_work_on_this_compiler<T>
{ };
} // namespace boost