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more complete function, method, and field traits

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BlackMATov
2021-07-06 04:14:21 +07:00
parent c006d10e33
commit 3a49cafe9f
1 changed files with 85 additions and 0 deletions
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85
headers/meta.hpp/meta_fwd.hpp
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@@ -165,3 +165,88 @@ namespace meta_hpp::detail
}
}
}
namespace meta_hpp::detail
{
template < typename Field >
struct field_traits;
template < typename T, typename I >
struct field_traits<T I::*> {
static constexpr bool is_const = false;
using value_type = T;
using instance_type = I;
};
template < typename T, typename I >
struct field_traits<const T I::*>
: field_traits<T I::*> {
static constexpr bool is_const = true;
};
}
namespace meta_hpp::detail
{
template < typename Function >
struct function_traits;
template < typename R, typename... Args >
struct function_traits<R(Args...)> {
static constexpr bool is_noexcept = false;
static constexpr std::size_t arity = sizeof...(Args);
using return_type = R;
using argument_types = std::tuple<Args...>;
};
template < typename R, typename... Args >
struct function_traits<R(*)(Args...)>
: function_traits<R(Args...)> {};
template < typename R, typename... Args >
struct function_traits<R(&)(Args...)>
: function_traits<R(Args...)> {};
template < typename R, typename... Args >
struct function_traits<R(*)(Args...) noexcept>
: function_traits<R(*)(Args...)> {
static constexpr bool is_noexcept = true;
};
template < typename R, typename... Args >
struct function_traits<R(&)(Args...) noexcept>
: function_traits<R(&)(Args...)> {
static constexpr bool is_noexcept = true;
};
}
namespace meta_hpp::detail
{
template < typename Method >
struct method_traits;
template < typename R, typename I, typename... Args >
struct method_traits<R(I::*)(Args...)>
: function_traits<R(Args...)> {
static constexpr bool is_const = false;
using instance_type = I;
};
template < typename R, typename I, typename... Args >
struct method_traits<R(I::*)(Args...) const>
: method_traits<R(I::*)(Args...)> {
static constexpr bool is_const = true;
};
template < typename R, typename I, typename... Args >
struct method_traits<R(I::*)(Args...) noexcept>
: method_traits<R(I::*)(Args...)> {
static constexpr bool is_noexcept = true;
};
template < typename R, typename I, typename... Args >
struct method_traits<R(I::*)(Args...) const noexcept>
: method_traits<R(I::*)(Args...)> {
static constexpr bool is_const = true;
static constexpr bool is_noexcept = true;
};
}