buffer_traits.hpp

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#pragma once
 
#include <cstddef>
#include <type_traits>

namespace jsocketpp::detail
{

template <typename T>
struct is_byte_like : std::bool_constant<std::is_same_v<T, char> || std::is_same_v<T, unsigned char> ||
                                         std::is_same_v<T, std::byte> || std::is_same_v<T, std::uint8_t>>
{
};

template <typename, typename = void> struct has_resize : std::false_type
{
};
template <typename T>
struct has_resize<T, std::void_t<decltype(std::declval<T&>().resize(std::size_t{}))>> : std::true_type
{
};

template <typename, typename = void> struct has_data : std::false_type
{
};
template <typename T> struct has_data<T, std::void_t<decltype(std::declval<T&>().data())>> : std::true_type
{
};

template <typename, typename = void> struct has_size : std::false_type
{
};
template <typename T> struct has_size<T, std::void_t<decltype(std::declval<const T&>().size())>> : std::true_type
{
};

template <typename T>
inline constexpr bool is_dynamic_buffer_v =
    has_resize<T>::value && has_data<T>::value && has_size<T>::value && is_byte_like<typename T::value_type>::value;

template <typename T>
inline constexpr bool is_fixed_buffer_v =
    has_data<T>::value && has_size<T>::value && !has_resize<T>::value && is_byte_like<typename T::value_type>::value;
 
} // namespace jsocketpp::detail