type_helpers.hpp

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#ifndef GUARD_SQLITE_DETAIL_TYPE_HELPERS_HPP_INCLUDED
#define GUARD_SQLITE_DETAIL_TYPE_HELPERS_HPP_INCLUDED
 
#include <chrono>
#include <optional>
#include <span>
#include <string_view>
#include <tuple>
#include <type_traits>
#include <vector>
 
namespace sqlite {
inline namespace v2 {
    namespace detail {
 
        template <typename T> inline constexpr bool always_false_v = false;
 
        template <typename T> struct always_false : std::false_type {};
 
        template <typename T> using decay_t = std::remove_cvref_t<T>;
 
        template <typename T> inline constexpr bool is_optional_v = false;
 
        template <typename T> inline constexpr bool is_optional_v<std::optional<T>> = true;
 
        template <typename T> struct optional_value {
            using type = T;
        };
 
        template <typename T> struct optional_value<std::optional<T>> {
            using type = T;
        };
 
        template <typename T> inline constexpr bool is_duration_v = false;
 
        template <typename Rep, typename Period>
        inline constexpr bool is_duration_v<std::chrono::duration<Rep, Period>> = true;
 
        template <typename T> inline constexpr bool is_time_point_v = false;
 
        template <typename Clock, typename Duration>
        inline constexpr bool is_time_point_v<std::chrono::time_point<Clock, Duration>> = true;
 
        template <typename T>
        inline constexpr bool is_string_like_v = std::is_convertible_v<T, std::string_view>;
 
        template <typename T>
        inline constexpr bool is_byte_vector_v =
            std::is_same_v<decay_t<T>, std::vector<unsigned char>>;
 
        template <typename T>
        inline constexpr bool is_unsigned_char_span_v =
            std::is_same_v<decay_t<T>, std::span<const unsigned char>>;
 
        template <typename T>
        inline constexpr bool is_byte_span_v =
            std::is_same_v<decay_t<T>, std::span<const std::byte>>;
 
        template <typename T>
        inline constexpr bool needs_generic_binding_v =
            is_optional_v<decay_t<T>> || is_duration_v<decay_t<T>> || is_time_point_v<decay_t<T>> ||
            std::is_enum_v<decay_t<T>>;
 
        template <typename... Ts> struct pack_size;
 
        template <typename... Ts>
        struct pack_size<std::tuple<Ts...>> : std::integral_constant<std::size_t, sizeof...(Ts)> {};
 
    } // namespace detail
} // namespace v2
} // namespace sqlite
 
#endif // GUARD_SQLITE_DETAIL_TYPE_HELPERS_HPP_INCLUDED