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add static_variant_visitor

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bolero-MURAKAMI 2012-12-20 00:09:05 +09:00
parent f01382e3e5
commit fce61f0def
6 changed files with 103 additions and 41 deletions
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41
sprout/variant/visitor_result.hpp Normal file
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@ -0,0 +1,41 @@
#ifndef SPROUT_VARIANT_VISITOR_RESULT_HPP
#define SPROUT_VARIANT_VISITOR_RESULT_HPP
#include <sprout/config.hpp>
#include <sprout/type_traits/has_xxx.hpp>
namespace sprout {
//
// has_visitor_result
//
SPROUT_HAS_XXX_TEMPLATE_DEF_LAZY(visitor_result);
namespace detail {
template<typename Visitor, typename Visitable, typename = void>
struct visitor_result_impl;
template<typename Visitor, typename Visitable>
struct visitor_result_impl<
Visitor, Visitable,
typename std::enable_if<sprout::has_visitor_result<Visitable>::value>::type
>
: public Visitable::template visitor_result<Visitor, Visitable>
{};
template<typename Visitor, typename Visitable>
struct visitor_result_impl<
Visitor, Visitable,
typename std::enable_if<!sprout::has_visitor_result<Visitable>::value>::type
> {
public:
typedef typename Visitor::result_type type;
};
} // namespace detail
//
// visitor_result
//
template<typename Visitor, typename Visitable>
struct visitor_result
: public sprout::detail::visitor_result_impl<Visitor, Visitable>
{};
} // namespace sprout
#endif // #ifndef SPROUT_VARIANT_VISITOR_RESULT_HPP