mirror of
https://github.com/ToruNiina/toml11.git
synced 2024-11-22 20:30:11 +00:00
246 lines
8.4 KiB
C++
246 lines
8.4 KiB
C++
// Copyright Toru Niina 2017.
|
|
// Distributed under the MIT License.
|
|
#ifndef TOML11_TRAITS_HPP
|
|
#define TOML11_TRAITS_HPP
|
|
#include <type_traits>
|
|
#include <utility>
|
|
#include <chrono>
|
|
#include <tuple>
|
|
#include <string>
|
|
#if __cplusplus >= 201703L
|
|
#if __has_include(<string_view>)
|
|
#include <string_view>
|
|
#endif // has_include(<string_view>)
|
|
#endif // cplusplus >= C++17
|
|
|
|
namespace toml
|
|
{
|
|
template<typename C, template<typename ...> class T, template<typename ...> class A>
|
|
class basic_value;
|
|
|
|
namespace detail
|
|
{
|
|
// ---------------------------------------------------------------------------
|
|
// check whether type T is a kind of container/map class
|
|
|
|
struct has_iterator_impl
|
|
{
|
|
template<typename T> static std::true_type check(typename T::iterator*);
|
|
template<typename T> static std::false_type check(...);
|
|
};
|
|
struct has_value_type_impl
|
|
{
|
|
template<typename T> static std::true_type check(typename T::value_type*);
|
|
template<typename T> static std::false_type check(...);
|
|
};
|
|
struct has_key_type_impl
|
|
{
|
|
template<typename T> static std::true_type check(typename T::key_type*);
|
|
template<typename T> static std::false_type check(...);
|
|
};
|
|
struct has_mapped_type_impl
|
|
{
|
|
template<typename T> static std::true_type check(typename T::mapped_type*);
|
|
template<typename T> static std::false_type check(...);
|
|
};
|
|
struct has_resize_method_impl
|
|
{
|
|
constexpr static std::size_t dummy=0;
|
|
template<typename T> static std::true_type check(decltype(std::declval<T>().resize(dummy))*);
|
|
template<typename T> static std::false_type check(...);
|
|
};
|
|
|
|
struct is_comparable_impl
|
|
{
|
|
template<typename T> static std::true_type check(decltype(std::declval<T>() < std::declval<T>())*);
|
|
template<typename T> static std::false_type check(...);
|
|
};
|
|
|
|
struct has_from_toml_method_impl
|
|
{
|
|
template<typename T, typename C,
|
|
template<typename ...> class Tb, template<typename ...> class A>
|
|
static std::true_type check(
|
|
decltype(std::declval<T>().from_toml(
|
|
std::declval<::toml::basic_value<C, Tb, A>>()))*);
|
|
|
|
template<typename T, typename C,
|
|
template<typename ...> class Tb, template<typename ...> class A>
|
|
static std::false_type check(...);
|
|
};
|
|
struct has_into_toml_method_impl
|
|
{
|
|
template<typename T>
|
|
static std::true_type check(decltype(std::declval<T>().into_toml())*);
|
|
template<typename T>
|
|
static std::false_type check(...);
|
|
};
|
|
|
|
/// Intel C++ compiler can not use decltype in parent class declaration, here
|
|
/// is a hack to work around it. https://stackoverflow.com/a/23953090/4692076
|
|
#ifdef __INTEL_COMPILER
|
|
#define decltype(...) std::enable_if<true, decltype(__VA_ARGS__)>::type
|
|
#endif
|
|
|
|
template<typename T>
|
|
struct has_iterator : decltype(has_iterator_impl::check<T>(nullptr)){};
|
|
template<typename T>
|
|
struct has_value_type : decltype(has_value_type_impl::check<T>(nullptr)){};
|
|
template<typename T>
|
|
struct has_key_type : decltype(has_key_type_impl::check<T>(nullptr)){};
|
|
template<typename T>
|
|
struct has_mapped_type : decltype(has_mapped_type_impl::check<T>(nullptr)){};
|
|
template<typename T>
|
|
struct has_resize_method : decltype(has_resize_method_impl::check<T>(nullptr)){};
|
|
template<typename T>
|
|
struct is_comparable : decltype(is_comparable_impl::check<T>(nullptr)){};
|
|
|
|
template<typename T, typename C,
|
|
template<typename ...> class Tb, template<typename ...> class A>
|
|
struct has_from_toml_method
|
|
: decltype(has_from_toml_method_impl::check<T, C, Tb, A>(nullptr)){};
|
|
|
|
template<typename T>
|
|
struct has_into_toml_method
|
|
: decltype(has_into_toml_method_impl::check<T>(nullptr)){};
|
|
|
|
#ifdef __INTEL_COMPILER
|
|
#undef decltype(...)
|
|
#endif
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// C++17 and/or/not
|
|
|
|
template<typename ...> struct conjunction : std::true_type{};
|
|
template<typename T> struct conjunction<T> : T{};
|
|
template<typename T, typename ... Ts>
|
|
struct conjunction<T, Ts...> :
|
|
std::conditional<static_cast<bool>(T::value), conjunction<Ts...>, T>::type
|
|
{};
|
|
|
|
template<typename ...> struct disjunction : std::false_type{};
|
|
template<typename T> struct disjunction<T> : T {};
|
|
template<typename T, typename ... Ts>
|
|
struct disjunction<T, Ts...> :
|
|
std::conditional<static_cast<bool>(T::value), T, disjunction<Ts...>>::type
|
|
{};
|
|
|
|
template<typename T>
|
|
struct negation : std::integral_constant<bool, !static_cast<bool>(T::value)>{};
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// type checkers
|
|
|
|
template<typename T> struct is_std_pair : std::false_type{};
|
|
template<typename T1, typename T2>
|
|
struct is_std_pair<std::pair<T1, T2>> : std::true_type{};
|
|
|
|
template<typename T> struct is_std_tuple : std::false_type{};
|
|
template<typename ... Ts>
|
|
struct is_std_tuple<std::tuple<Ts...>> : std::true_type{};
|
|
|
|
template<typename T> struct is_chrono_duration: std::false_type{};
|
|
template<typename Rep, typename Period>
|
|
struct is_chrono_duration<std::chrono::duration<Rep, Period>>: std::true_type{};
|
|
|
|
template<typename T>
|
|
struct is_map : conjunction< // map satisfies all the following conditions
|
|
has_iterator<T>, // has T::iterator
|
|
has_value_type<T>, // has T::value_type
|
|
has_key_type<T>, // has T::key_type
|
|
has_mapped_type<T> // has T::mapped_type
|
|
>{};
|
|
template<typename T> struct is_map<T&> : is_map<T>{};
|
|
template<typename T> struct is_map<T const&> : is_map<T>{};
|
|
template<typename T> struct is_map<T volatile&> : is_map<T>{};
|
|
template<typename T> struct is_map<T const volatile&> : is_map<T>{};
|
|
|
|
template<typename T>
|
|
struct is_container : conjunction<
|
|
negation<is_map<T>>, // not a map
|
|
negation<std::is_same<T, std::string>>, // not a std::string
|
|
#if __cplusplus >= 201703L
|
|
negation<std::is_same<T, std::string_view>>, // not a std::string_view
|
|
#endif
|
|
has_iterator<T>, // has T::iterator
|
|
has_value_type<T> // has T::value_type
|
|
>{};
|
|
template<typename T> struct is_container<T&> : is_container<T>{};
|
|
template<typename T> struct is_container<T const&> : is_container<T>{};
|
|
template<typename T> struct is_container<T volatile&> : is_container<T>{};
|
|
template<typename T> struct is_container<T const volatile&> : is_container<T>{};
|
|
|
|
template<typename T>
|
|
struct is_basic_value: std::false_type{};
|
|
template<typename T> struct is_basic_value<T&> : is_basic_value<T>{};
|
|
template<typename T> struct is_basic_value<T const&> : is_basic_value<T>{};
|
|
template<typename T> struct is_basic_value<T volatile&> : is_basic_value<T>{};
|
|
template<typename T> struct is_basic_value<T const volatile&> : is_basic_value<T>{};
|
|
template<typename C, template<typename ...> class M, template<typename ...> class V>
|
|
struct is_basic_value<::toml::basic_value<C, M, V>>: std::true_type{};
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// C++14 index_sequence
|
|
|
|
template<std::size_t ... Ns> struct index_sequence{};
|
|
|
|
template<typename IS, std::size_t N> struct push_back_index_sequence{};
|
|
template<std::size_t N, std::size_t ... Ns>
|
|
struct push_back_index_sequence<index_sequence<Ns...>, N>
|
|
{
|
|
typedef index_sequence<Ns..., N> type;
|
|
};
|
|
|
|
template<std::size_t N>
|
|
struct index_sequence_maker
|
|
{
|
|
typedef typename push_back_index_sequence<
|
|
typename index_sequence_maker<N-1>::type, N>::type type;
|
|
};
|
|
template<>
|
|
struct index_sequence_maker<0>
|
|
{
|
|
typedef index_sequence<0> type;
|
|
};
|
|
template<std::size_t N>
|
|
using make_index_sequence = typename index_sequence_maker<N-1>::type;
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// C++14 enable_if_t
|
|
template<bool B, typename T>
|
|
using enable_if_t = typename std::enable_if<B, T>::type;
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// return_type_of_t
|
|
|
|
#if __cplusplus >= 201703L
|
|
|
|
template<typename F, typename ... Args>
|
|
using return_type_of_t = std::invoke_result_t<F, Args...>;
|
|
|
|
#else
|
|
// result_of is deprecated after C++17
|
|
template<typename F, typename ... Args>
|
|
using return_type_of_t = typename std::result_of<F(Args...)>::type;
|
|
|
|
#endif
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// is_string_literal
|
|
//
|
|
// to use this, pass `typename remove_reference<T>::type` to T.
|
|
|
|
template<typename T>
|
|
struct is_string_literal:
|
|
disjunction<
|
|
std::is_same<const char*, T>,
|
|
conjunction<
|
|
std::is_array<T>,
|
|
std::is_same<const char, typename std::remove_extent<T>::type>
|
|
>
|
|
>{};
|
|
|
|
}// detail
|
|
}//toml
|
|
#endif // TOML_TRAITS
|