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make from_u8string inline

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This commit is contained in:
Artem Pavlenko 2021-05-17 16:08:35 +01:00
parent 6666d5f540
commit c85fb5a319
1 changed files with 51 additions and 3 deletions
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54
include/mapnik/util/from_u8string.hpp
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@ -25,24 +25,72 @@
// stl
#include <string>
#include <utility>
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1423r2.html
// Explicit conversion functions can be used, in a C++17 compatible manner, to cope with the change of return type to// the std::filesystem::path member functions when a UTF-8 encoded path is desired in an object of type std::string.
namespace mapnik { namespace util {
std::string from_u8string(const std::string &s) {
inline std::string from_u8string(std::string const& s) {
return s;
}
std::string from_u8string(std::string &&s) {
inline std::string from_u8string(std::string &&s) {
return std::move(s);
}
#if defined(__cpp_lib_char8_t)
std::string from_u8string(const std::u8string &s) {
inline std::string from_u8string(std::u8string const&s) {
return std::string(s.begin(), s.end());
}
#endif
/*
template<std::size_t N>
struct char_array {
template<std::size_t P, std::size_t... I>
constexpr char_array(
const char (&r)[P],
std::index_sequence<I...>)
:
data{(I<P?r[I]:'\0')...}
{}
template<std::size_t P, typename = std::enable_if_t<(P<=N)>>
constexpr char_array(const char(&r)[P])
: char_array(r, std::make_index_sequence<N>())
{}
#if defined(__cpp_char8_t)
template<std::size_t P, std::size_t... I>
constexpr char_array(
const char8_t (&r)[P],
std::index_sequence<I...>)
:
data{(I<P?static_cast<char>(r[I]):'\0')...}
{}
template<std::size_t P, typename = std::enable_if_t<(P<=N)>>
constexpr char_array(const char8_t(&r)[P])
: char_array(r, std::make_index_sequence<N>())
{}
#endif
constexpr (&operator const char() const)[N] {
return data;
}
constexpr (&operator char())[N] {
return data;
}
char data[N];
};
template<std::size_t N>
char_array(const char(&)[N]) -> char_array<N>;
#if defined(__cpp_char8_t)
template<std::size_t N>
char_array(const char8_t(&)[N]) -> char_array<N>;
#endif
*/
}} // end of namespace mapnik
#endif // FROM_U8STRING_HPP