traits.hpp

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#pragma once
 
#include <array>
#include <cstdint>
#include <type_traits>
#include <vector>
 
namespace mbgl {
 
template<typename T>
constexpr auto underlying_type(T t) -> typename std::underlying_type_t<T> {
    return typename std::underlying_type_t<T>(t);
}
 
template <typename T> struct is_utf16char_like: std::false_type {};
template <typename T> struct is_utf16char_like<const T>: is_utf16char_like<T> {};
template <> struct is_utf16char_like<char16_t>: std::true_type {};
template <> struct is_utf16char_like<wchar_t>: std::true_type {};
template <> struct is_utf16char_like<uint16_t>: std::true_type {};
 
template <typename T> using is_utf16char_like_pointer = std::integral_constant<bool, std::is_pointer_v<T>
                                                                                     && is_utf16char_like<typename std::remove_pointer<T>::type>::value>;
 
template <class OutPointer, class InChar>
typename std::enable_if<is_utf16char_like<InChar>::value && is_utf16char_like_pointer<OutPointer>::value, OutPointer>::type utf16char_cast(InChar *in)
{
    return reinterpret_cast<OutPointer>(in);
}
 
template <typename T>
struct is_linear_container : std::false_type {};
 
template <typename T, std::size_t N>
struct is_linear_container<std::array<T, N>> : std::true_type {};
template <typename... Ts>
struct is_linear_container<std::vector<Ts...>> : std::true_type {};
 
} // namespace mbgl