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feat: add meta function to detect conversions

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ToruNiina 2019-06-01 16:03:26 +09:00
parent eaa3604dce
commit b8d3038d38
1 changed files with 53 additions and 0 deletions
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53
toml/types.hpp
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@ -139,6 +139,59 @@ template<typename T, typename V> struct is_exact_toml_type<T const&, V>
template<typename T, typename V> struct is_exact_toml_type<T volatile&, V> : is_exact_toml_type<T, V>{};
template<typename T, typename V> struct is_exact_toml_type<T const volatile&, V>: is_exact_toml_type<T, V>{};
// meta-function that check type T is convertible to toml::* types
template<typename T, typename Value>
struct is_convertible_to_toml_value : disjunction<
std::is_same<T, boolean>, // T is bool or
std::is_integral<T>, // T is an integer or
std::is_floating_point<T>, // T is a floating point or
std::is_same<T, std::string>, // T is std::string or
std::is_same<T, toml::string>, // T is toml::string or
is_string_literal<T>, // T is "string literal" or
std::is_same<T, toml::local_date>, // T is local_date or
std::is_same<T, toml::local_time>, // T is local_time or
std::is_same<T, toml::local_datetime>, // T is local_datetime or
std::is_same<T, toml::offset_datetime>, // T is offset_datetime or
std::is_same<T, std::chrono::system_clock::time_point> // T is time_point or
is_chrono_duration<T>, // T is a duration or
std::is_same<T, typename Value::array_type>, // T is an array type or
std::is_same<T, typename Value::table_type>, // T is an array type or
>{}
// meta-function that returns value_t that represent the convertible type
template<typename T, typename Value>
struct convertible_toml_type_of : typename std::conditional<
/* if */ is_exact_toml_type<T, Value>::value,
/* then */ value_t_constant<type_to_enum<T, Value>::value>,
/* else */ typename std::conditional<
// ----------------------------------------------------------------------
/* if */ std::is_integral<T>::value,
/* then */ value_t_constant<value_t::integer>,
/* else */ typename std::conditional<
// ----------------------------------------------------------------------
/* if */ std::is_floating_point<T>::value,
/* then */ value_t_constant<value_t::floating>,
/* else */ typename std::conditional<
// ----------------------------------------------------------------------
/* if */ std::is_same<std::string>::value,
/* then */ value_t_constant<value_t::string>,
/* else */ typename std::conditional<
// ----------------------------------------------------------------------
/* if */ is_string_literal<T>,
/* then */ value_t_constant<value_t::string>,
/* else */ typename std::conditional<
// ----------------------------------------------------------------------
/* if */ is_chrono_duration<T>,
/* then */ value_t_constant<value_t::local_time>,
/* else */ typename std::conditional<
// ----------------------------------------------------------------------
/* if */ std::is_same<T, std::chrono::system_clock::time_point>,
/* then */ value_t_constant<value_t::offset_datetime>,
/* else */ value_t_constant<value_t::empty>,
// ----------------------------------------------------------------------
>::type>::type>::type>::type>::type>::type>::type
>{}
} // detail
} // toml
#endif// TOML11_TYPES_H