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feat: generalize string converter

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ToruNiina
2024-07-10 02:37:29 +09:00
parent a77516a2d0
commit 31810136d1
1 changed files with 26 additions and 28 deletions
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52
include/toml11/utility.hpp
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@@ -101,20 +101,22 @@ inline std::string make_string(std::size_t len, char c)
// ---------------------------------------------------------------------------
template<typename Char, typename Traits, typename Alloc>
template<typename Char, typename Traits, typename Alloc,
typename Char2, typename Traits2, typename Alloc2>
struct to_string_of_impl
{
static_assert(sizeof(Char) == sizeof(char), "");
static_assert(sizeof(Char2) == sizeof(char), "");
static std::basic_string<Char, Traits, Alloc> invoke(std::string s)
static std::basic_string<Char, Traits, Alloc> invoke(std::basic_string<Char2, Traits2, Alloc2> s)
{
std::basic_string<Char, Traits, Alloc> retval;
std::transform(s.begin(), s.end(), std::back_inserter(retval),
[](const char c) {return static_cast<Char>(c);});
[](const Char2 c) {return static_cast<Char>(c);});
return retval;
}
template<std::size_t N>
static std::basic_string<Char, Traits, Alloc> invoke(const char (&s)[N])
static std::basic_string<Char, Traits, Alloc> invoke(const Char2 (&s)[N])
{
std::basic_string<Char, Traits, Alloc> retval;
std::transform(std::begin(s), std::end(s), std::back_inserter(retval),
@@ -123,42 +125,38 @@ struct to_string_of_impl
}
};
template<>
struct to_string_of_impl<char, std::char_traits<char>, std::allocator<char>>
template<typename Char, typename Traits, typename Alloc>
struct to_string_of_impl<Char, Traits, Alloc, Char, Traits, Alloc>
{
static std::string invoke(std::string s)
static_assert(sizeof(Char) == sizeof(char), "");
static std::basic_string<Char, Traits, Alloc> invoke(std::basic_string<Char, Traits, Alloc> s)
{
return s;
}
template<std::size_t N>
static std::string invoke(const char (&s)[N])
static std::basic_string<Char, Traits, Alloc> invoke(const Char (&s)[N])
{
return std::string(s);
return std::basic_string<Char, Traits, Alloc>(s);
}
};
template<typename Char, typename Traits = std::char_traits<Char>,
typename Alloc = std::allocator<Char>>
std::basic_string<Char, Traits, Alloc> to_string_of(std::string s)
template<typename Char,
typename Traits = std::char_traits<Char>,
typename Alloc = std::allocator<Char>,
typename Char2, typename Traits2, typename Alloc2>
std::basic_string<Char, Traits, Alloc>
to_string_of(std::basic_string<Char2, Traits2, Alloc2> s)
{
return to_string_of_impl<Char, Traits, Alloc>::invoke(std::move(s));
return to_string_of_impl<Char, Traits, Alloc, Char2, Traits2, Alloc2>::invoke(std::move(s));
}
template<typename Char, std::size_t N, typename Traits = std::char_traits<Char>,
typename Alloc = std::allocator<Char>>
template<typename Char,
typename Traits = std::char_traits<Char>,
typename Alloc = std::allocator<Char>,
typename Char2, typename Traits2, typename Alloc2, std::size_t N>
std::basic_string<Char, Traits, Alloc> to_string_of(const char (&s)[N])
{
return to_string_of_impl<Char, Traits, Alloc>::template invoke<N>(s);
}
template<typename Char, typename Traits, typename Alloc>
std::string to_char_string(std::basic_string<Char, Traits, Alloc> s)
{
static_assert(sizeof(Char) == sizeof(char), "");
std::string retval;
std::transform(s.begin(), s.end(), std::back_inserter(retval),
[](const Char c) {return static_cast<char>(c);});
return retval;
return to_string_of_impl<Char, Traits, Alloc, Char2, Traits2, Alloc2>::template invoke<N>(s);
}
} // namespace detail