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refactor: introduce value_t_constant

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as an alias for integral_constant
This commit is contained in:
ToruNiina
2019-06-01 16:01:48 +09:00
parent 8acc348106
commit eaa3604dce
1 changed files with 15 additions and 11 deletions
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26
toml/types.hpp
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@@ -81,6 +81,10 @@ inline std::basic_string<charT, traits, alloc> stringize(value_t t)
namespace detail
{
// helper to define a type that represents a value_t value.
template<value_t V>
using value_t_constant = std::integral_constant<value_t, V>;
// meta-function that convertes from value_t to the exact toml type that corresponds to.
// It takes toml::basic_value type because array and table types depend on it.
template<value_t t, typename Value> struct enum_to_type {using type = void ;};
@@ -100,21 +104,21 @@ template<typename Value> struct enum_to_type<value_t::table , Value>{us
template<typename T, typename Value>
struct type_to_enum : typename std::conditional<
std::is_same<T, typename Value::array_type>::value, // if T == array_type,
std::integral_constant<value_t, value_t::array>, // then value_t::array
value_t_constant<value_t::array>, // then value_t::array
typename std::conditional< // else...
std::is_same<T, typename Value::table_type>::value, // if T == table_type
std::integral_constant<value_t, value_t::table>, // then value_t::table
std::integral_constant<value_t, value_t::empty> // else value_t::empty
value_t_constant<value_t::table>, // then value_t::table
value_t_constant<value_t::empty> // else value_t::empty
>::type
>::type {}
template<typename Value> struct type_to_enum<boolean , Value>: std::integral_constant<value_t, value_t::boolean > {};
template<typename Value> struct type_to_enum<integer , Value>: std::integral_constant<value_t, value_t::integer > {};
template<typename Value> struct type_to_enum<floating , Value>: std::integral_constant<value_t, value_t::floating > {};
template<typename Value> struct type_to_enum<string , Value>: std::integral_constant<value_t, value_t::string > {};
template<typename Value> struct type_to_enum<offset_datetime, Value>: std::integral_constant<value_t, value_t::offset_datetime> {};
template<typename Value> struct type_to_enum<local_datetime , Value>: std::integral_constant<value_t, value_t::local_datetime > {};
template<typename Value> struct type_to_enum<local_date , Value>: std::integral_constant<value_t, value_t::local_date > {};
template<typename Value> struct type_to_enum<local_time , Value>: std::integral_constant<value_t, value_t::local_time > {};
template<typename Value> struct type_to_enum<boolean , Value>: value_t_constant<value_t::boolean > {};
template<typename Value> struct type_to_enum<integer , Value>: value_t_constant<value_t::integer > {};
template<typename Value> struct type_to_enum<floating , Value>: value_t_constant<value_t::floating > {};
template<typename Value> struct type_to_enum<string , Value>: value_t_constant<value_t::string > {};
template<typename Value> struct type_to_enum<offset_datetime, Value>: value_t_constant<value_t::offset_datetime> {};
template<typename Value> struct type_to_enum<local_datetime , Value>: value_t_constant<value_t::local_datetime > {};
template<typename Value> struct type_to_enum<local_date , Value>: value_t_constant<value_t::local_date > {};
template<typename Value> struct type_to_enum<local_time , Value>: value_t_constant<value_t::local_time > {};
// meta-function that checks the type T is the same as one of the toml::* types.
template<typename T, typename Value>