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strongdef: make equality operator constexpr

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This commit is contained in:
Danny Robson 2016-02-03 14:37:38 +11:00
parent 5a3165d233
commit b70a84c9be
1 changed files with 13 additions and 4 deletions
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17
strongdef.hpp
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@ -64,13 +64,22 @@ namespace util {
// prevents the conversion operator getting invoked and falsely
// allowing equality with different types or tags.
template <typename U, typename TagU>
std::enable_if_t<!std::is_same<T,U>::value || !std::is_same<Tag,TagU>::value,bool>
operator== (const strongdef<U,TagU> &rhs) = delete;
std::enable_if_t<
!std::is_same<T,U>::value ||
!std::is_same<Tag,TagU>::value,
bool
>
operator== (const strongdef<U,TagU> &rhs) const = delete;
// provide a usable equality for equal types and tags
template <typename U, typename TagU>
std::enable_if_t<std::is_same<T,U>::value && std::is_same<Tag,TagU>::value,bool>
operator== (const strongdef<U,TagU> &rhs) { return data == rhs.data; }
constexpr
std::enable_if_t<
std::is_same<T,U>::value &&
std::is_same<Tag,TagU>::value,
bool
>
operator== (const strongdef<U,TagU> &rhs) const { return data == rhs.data; }
T data;
};