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make has_mapped_type struct friendly

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This commit is contained in:
Vladimir Petrigo
2016-10-08 01:03:35 +03:00
parent a0ef5a194c
commit e9fde3e116
2 changed files with 12 additions and 6 deletions
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9
src/json.hpp
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@ -112,10 +112,13 @@ template<typename T>
struct has_mapped_type struct has_mapped_type
{ {
private: private:
template<typename C> static char test(typename C::mapped_type*); template <typename U, typename = typename U::mapped_type>
template<typename C> static char (&test(...))[2]; static int detect(U&&);
static void detect(...);
public: public:
static constexpr bool value = sizeof(test<T>(0)) == 1; static constexpr bool value =
std::is_integral<decltype(detect(std::declval<T>()))>::value;
}; };
/*! /*!

9
src/json.hpp.re2c
View File

@ -112,10 +112,13 @@ template<typename T>
struct has_mapped_type struct has_mapped_type
{ {
private: private:
template<typename C> static char test(typename C::mapped_type*); template <typename U, typename = typename U::mapped_type>
template<typename C> static char (&test(...))[2]; static int detect(U&&);
static void detect(...);
public: public:
static constexpr bool value = sizeof(test<T>(0)) == 1; static constexpr bool value =
std::is_integral<decltype(detect(std::declval<T>()))>::value;
}; };
/*! /*!