1 #pragma once
2 
3 #include <cstdint>
4 #include <type_traits>
5 
6 namespace mbgl {
7 
8 template<typename T>
underlying_type(T t)9 constexpr auto underlying_type(T t) -> typename std::underlying_type_t<T> {
10     return typename std::underlying_type_t<T>(t);
11 }
12 
13 template <typename T> struct is_utf16char_like: std::false_type {};
14 template <typename T> struct is_utf16char_like<const T>: is_utf16char_like<T> {};
15 template <> struct is_utf16char_like<char16_t>: std::true_type {};
16 template <> struct is_utf16char_like<wchar_t>: std::true_type {};
17 template <> struct is_utf16char_like<uint16_t>: std::true_type {};
18 
19 template <typename T> using is_utf16char_like_pointer = std::integral_constant<bool, std::is_pointer<T>::value
20                                                                                      && is_utf16char_like<typename std::remove_pointer<T>::type>::value>;
21 
22 template <class OutPointer, class InChar>
utf16char_cast(InChar * in)23 typename std::enable_if<is_utf16char_like<InChar>::value && is_utf16char_like_pointer<OutPointer>::value, OutPointer>::type utf16char_cast(InChar *in)
24 {
25     return reinterpret_cast<OutPointer>(in);
26 }
27 
28 } // namespace mbgl
29