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remove copy converting ctor and fix converting move constuctor to use 'universal reference' and perfect forwarding

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( re : http://isocpp.org/blog/2012/11/universal-references-in-c11-scott-meyers)
This commit is contained in:
artemp 2014-09-04 14:54:42 +01:00
parent c52994ff8b
commit 0985cc907d
1 changed files with 3 additions and 13 deletions
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16
include/mapnik/util/variant.hpp
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@ -541,21 +541,11 @@ public:
: type_index(detail::invalid_value) {}
template <typename T, class = typename std::enable_if<
detail::is_valid_type<T, Types...>::value>::type>
VARIANT_INLINE explicit variant(T const& val) noexcept
: type_index(detail::value_traits<T, Types...>::index)
{
constexpr std::size_t index = sizeof...(Types) - detail::value_traits<T, Types...>::index - 1;
using target_type = typename detail::select_type<index, Types...>::type;
new (&data) target_type(val);
}
template <typename T, class = typename std::enable_if<
detail::is_valid_type<T, Types...>::value>::type>
detail::is_valid_type<typename std::remove_reference<T>::type, Types...>::value>::type>
VARIANT_INLINE variant(T && val) noexcept
: type_index(detail::value_traits<T, Types...>::index)
: type_index(detail::value_traits<typename std::remove_reference<T>::type, Types...>::index)
{
constexpr std::size_t index = sizeof...(Types) - detail::value_traits<T, Types...>::index - 1;
constexpr std::size_t index = sizeof...(Types) - detail::value_traits<typename std::remove_reference<T>::type, Types...>::index - 1;
using target_type = typename detail::select_type<index, Types...>::type;
new (&data) target_type(std::forward<T>(val)); // nothrow
}