mirror of
https://github.com/ToruNiina/toml11.git
synced 2024-11-26 22:30:06 +00:00
70 lines
1.7 KiB
C++
70 lines
1.7 KiB
C++
#ifndef TOML11_FROM_TOML
|
|
#define TOML11_FROM_TOML
|
|
#include "get.hpp"
|
|
|
|
namespace toml
|
|
{
|
|
|
|
template<typename T>
|
|
void from_toml(T& x, const toml::value& v)
|
|
{
|
|
x = toml::get<T>(v);
|
|
return;
|
|
}
|
|
|
|
namespace detail
|
|
{
|
|
|
|
template<typename T>
|
|
constexpr toml::value_t determine_castable_type()
|
|
{
|
|
return check_type<T>() != toml::value_t::Unknown ? check_type<T>() :
|
|
toml::detail::is_map<T>::value ? toml::value_t::Table :
|
|
toml::detail::is_container<T>::value ? toml::value_t::Array :
|
|
toml::value_t::Unknown;
|
|
}
|
|
|
|
template<std::size_t N, typename ... Ts>
|
|
struct from_toml_tie_impl
|
|
{
|
|
constexpr static std::size_t index = sizeof...(Ts) - N;
|
|
constexpr static toml::value_t type_index =
|
|
determine_castable_type<
|
|
typename std::tuple_element<index, std::tuple<Ts...>>::type>();
|
|
|
|
static void invoke(std::tuple<Ts& ...> tie, const toml::value& v)
|
|
{
|
|
// static_cast is needed because with intel c++ compiler, operator==
|
|
// is only defined when the two types are strictly equal, and type_index
|
|
// is const toml::value_t, while v.type() is toml::value_t.
|
|
if(static_cast<toml::value_t>(type_index) == v.type())
|
|
{
|
|
from_toml(std::get<index>(tie), v);
|
|
return;
|
|
}
|
|
return from_toml_tie_impl<N-1, Ts...>::invoke(tie, v);
|
|
}
|
|
};
|
|
|
|
template<typename ... Ts>
|
|
struct from_toml_tie_impl<0, Ts...>
|
|
{
|
|
static void invoke(std::tuple<Ts& ...> tie, const toml::value& v)
|
|
{
|
|
return;
|
|
}
|
|
};
|
|
|
|
} // detail
|
|
|
|
template<typename ... Ts>
|
|
void from_toml(std::tuple<Ts& ...> tie, const toml::value& v)
|
|
{
|
|
detail::from_toml_tie_impl<sizeof...(Ts), Ts...>::invoke(tie, v);
|
|
return;
|
|
}
|
|
|
|
|
|
} // toml
|
|
#endif // TOML11_FROM_TOML
|