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string_literal
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string_literal
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// D3933 - A compile-time string library template with UDL operator templates
// N4236 - A compile-time string library template with UDL operator templates
namespace std
{
template<typename _CharT, _CharT... _Chars>
class basic_string_literal;
inline namespace literals {
template<typename _CharT, _CharT... _Chars>
constexpr basic_string_literal<_CharT, _Chars...> operator""S();
}
template<typename _CharT, _CharT... _Chars>
class basic_string_literal
{
friend /*constexpr*/ basic_string_literal operator""S<_CharT, _Chars...>();
private:
static constexpr const _CharT _M_data[]{_Chars..., _CharT{}};
public:
constexpr basic_string_literal() = default;
using value_type = _CharT;
using size_type = std::size_t;
using difference_type = std::size_t;
using tail_type = basic_string_literal<_CharT>;
// Size-related functions
constexpr size_type size() const
{ return sizeof...(_Chars); }
constexpr size_type length() const
{ return sizeof...(_Chars); }
constexpr bool empty() const
{ return sizeof...(_Chars) == 0; }
// Element accessor functions
constexpr _CharT
operator[](size_type pos) const
{ return _M_data[pos]; }
template<size_type _Idx>
constexpr _CharT
at() const
{ return _M_data[_Idx]; }
constexpr _CharT
at(size_type pos) const
{ return _M_data[pos]; }
constexpr _CharT
back() const
{ return _M_data[this->size() - 1]; }
constexpr _CharT
front() const
{ return _M_data[0]; }
// Search functions
template<_CharT... _OtherChars>
constexpr size_type find(const basic_string_literal<_CharT, _OtherChars...>& str, size_type pos = 0) const;
constexpr size_type find(const _CharT* s, size_type pos, size_type count) const;
constexpr size_type find(const _CharT* s, size_type pos = 0) const;
constexpr size_type find(_CharT ch, size_type pos = 0) const;
template<_CharT... _OtherChars>
constexpr size_type rfind(const basic_string_literal<_CharT, _OtherChars...>& str, std::size_t pos = sizeof...(_Chars)) const;
constexpr size_type rfind(const _CharT* s, size_type pos, size_type count) const;
constexpr size_type rfind(const _CharT* s, size_type pos = sizeof...(_Chars)) const;
constexpr size_type rfind(_CharT ch, size_t pos = sizeof...(_Chars)) const;
template<_CharT... _OtherChars>
constexpr size_type find_first_of(const basic_string_literal<_CharT, _OtherChars...>& str, size_type pos = 0) const;
constexpr size_type find_first_of(const _CharT* s, size_type pos, size_type count) const;
constexpr size_type find_first_of(const _CharT* s, size_type pos = 0) const;
constexpr size_type find_first_of(_CharT ch, size_type pos = 0) const;
template<_CharT... _OtherChars>
constexpr size_type find_first_not_of(const basic_string_literal<_CharT, _OtherChars...>& str, size_type pos = 0) const;
constexpr size_type find_first_not_of(const _CharT* s, size_type pos, size_type count) const;
constexpr size_type find_first_not_of(const _CharT* s, size_type pos = 0) const;
constexpr size_type find_first_not_of(_CharT ch, size_type pos = 0) const;
template<_CharT... _OtherChars>
constexpr size_type find_last_of(const basic_string_literal<_CharT, _OtherChars...>& str, size_type pos = sizeof...(_Chars)) const;
constexpr size_type find_last_of(const _CharT* s, size_type pos, size_type count) const;
constexpr size_type find_last_of(const _CharT* s, size_type pos = sizeof...(_Chars)) const;
constexpr size_type find_last_of(_CharT ch, size_t pos = sizeof...(_Chars)) const;
template<_CharT... _OtherChars>
constexpr size_type find_last_not_of(const basic_string_literal<_CharT, _OtherChars...>& str, size_type pos = sizeof...(_Chars)) const;
constexpr size_type find_last_not_of(const _CharT* s, size_type pos, size_type count) const;
constexpr size_type find_last_not_of(const _CharT* s, size_type pos = sizeof...(_Chars)) const;
constexpr size_type find_last_not_of(_CharT ch, size_t pos = sizeof...(_Chars)) const;
// Comparison functions
template<_CharT... _OtherChars>
constexpr int compare(const basic_string_literal<_CharT, _OtherChars...> & other) const;
template<typename _Traits = char_traits<_CharT>, typename _Alloc = allocator<_CharT>>
constexpr int compare(const basic_string<_CharT, _Traits, _Alloc>& str) const;
template<typename _Traits = char_traits<_CharT>, typename _Alloc = allocator<_CharT>>
constexpr int compare(size_type pos1, size_type count1,
const basic_string<_CharT, _Traits, _Alloc>& str) const;
template<typename _Traits = char_traits<_CharT>, typename _Alloc = allocator<_CharT>>
constexpr int compare(size_type pos1, size_type count1,
const basic_string<_CharT, _Traits, _Alloc>& str,
size_type pos2, size_type count2) const;
constexpr int compare(const _CharT* s) const;
constexpr int compare(size_type pos1, size_type count1, const _CharT* s) const;
constexpr int compare(size_type pos1, size_type count1,
const _CharT* s, size_type count2) const;
// Conversion functions
constexpr const char *
c_str() const
{ return _M_data; }
constexpr const char *
data() const
{ return _M_data; }
std::string
to_string() const;
constexpr operator const char*() const;
constexpr long long
to_number() const;
};
template<typename _CharT>
class basic_string_literal<_CharT>
{
friend /*constexpr*/ basic_string_literal operator""S<_CharT>();
private:
static constexpr const _CharT _M_data[]{_CharT{}};
public:
constexpr basic_string_literal() = default;
using value_type = _CharT;
using size_type = std::size_t;
using difference_type = std::size_t;
using tail_type = basic_string_literal<_CharT>;
constexpr size_type
size() const
{ return 1; }
constexpr size_type
length() const
{ return 1; }
constexpr bool
empty() const
{ return false; }
template<_CharT... _OtherChars>
constexpr int compare(const basic_string_literal<_CharT, _OtherChars...>& other) const;
constexpr int compare(const basic_string<_CharT>& str) const;
constexpr int compare(std::size_t pos1, std::size_t count1, const basic_string<_CharT>& str) const;
constexpr int compare(std::size_t pos1, std::size_t count1, const basic_string<_CharT>& str, std::size_t pos2, std::size_t count2) const;
constexpr int compare(const _CharT* s) const;
constexpr int compare(std::size_t pos1, std::size_t count1, const _CharT* s) const;
constexpr int compare(std::size_t pos1, std::size_t count1, const _CharT* s, std::size_t count2) const;
constexpr const char * c_str() const;
constexpr const char * data() const;
std::string to_string() const;
constexpr size_type to_number() const;
constexpr operator const char*() const;
operator std::string() const;
};
inline namespace literals
{
template<typename _CharT, _CharT... _Chars>
constexpr basic_string_literal<_CharT, _Chars...>
operator""S()
{ return basic_string_literal<_CharT, _Chars...>(); }
}
// Concatenation
template<typename _CharT, _CharT... _LeftChars, _CharT... _RightChars>
inline constexpr auto
operator+(const basic_string_literal<_CharT, _LeftChars...>& lhs,
const basic_string_literal<_CharT, _RightChars...>& rhs)
-> basic_string_literal<_CharT, _LeftChars..., _RightChars...>;
// Relational operators
template<typename _CharT, _CharT... _LeftChars, _CharT... _RightChars>
constexpr bool
operator==(const basic_string_literal<_CharT, _LeftChars...>& lhs,
const basic_string_literal<_CharT, _RightChars...>& rhs);
template<typename _CharT, _CharT... _LeftChars, _CharT... _RightChars>
constexpr bool
operator!=(const basic_string_literal<_CharT, _LeftChars...>& lhs,
const basic_string_literal<_CharT, _RightChars...>& rhs);
template<typename _CharT, _CharT... _LeftChars, _CharT... _RightChars>
constexpr bool
operator<(const basic_string_literal<_CharT, _LeftChars...>& lhs,
const basic_string_literal<_CharT, _RightChars...>& rhs);
template<typename _CharT, _CharT... _LeftChars, _CharT... _RightChars>
constexpr bool
operator<=(const basic_string_literal<_CharT, _LeftChars...>& lhs,
const basic_string_literal<_CharT, _RightChars...>& rhs);
template<typename _CharT, _CharT... _LeftChars, _CharT... _RightChars>
constexpr bool
operator>(const basic_string_literal<_CharT, _LeftChars...>& lhs,
const basic_string_literal<_CharT, _RightChars...>& rhs);
template<typename _CharT, _CharT... _LeftChars, _CharT... _RightChars>
constexpr bool
operator>=(const basic_string_literal<_CharT, _LeftChars...>& lhs,
const basic_string_literal<_CharT, _RightChars...>& rhs);
template<typename _CharT, _CharT... _Chars>
constexpr bool
operator==(const _CharT* lhs,
const basic_string_literal<_CharT, _Chars...>& rhs);
template<typename _CharT, _CharT... _Chars>
constexpr bool
operator==(const basic_string_literal<_CharT, _Chars...>& lhs,
const _CharT* rhs);
template<typename _CharT, _CharT... _Chars>
constexpr bool
operator!=(const _CharT* lhs,
const basic_string_literal<_CharT, _Chars...>& rhs);
template<typename _CharT, _CharT... _Chars>
constexpr bool
operator!=(const basic_string_literal<_CharT, _Chars...>& lhs,
const _CharT* rhs);
template<typename _CharT, _CharT... _Chars>
constexpr bool
operator<(const _CharT* lhs,
const basic_string_literal<_CharT, _Chars...>& rhs);
template<typename _CharT, _CharT... _Chars>
constexpr bool
operator<(const basic_string_literal<_CharT, _Chars...>& lhs,
const _CharT* rhs);
template<typename _CharT, _CharT... _Chars>
constexpr bool
operator<=(const _CharT* lhs,
const basic_string_literal<_CharT, _Chars...>& rhs);
template<typename _CharT, _CharT... _Chars>
constexpr bool
operator<=(const basic_string_literal<_CharT, _Chars...>& lhs,
const _CharT* rhs);
template<typename _CharT, _CharT... _Chars>
constexpr bool
operator>(const _CharT* lhs,
const basic_string_literal<_CharT, _Chars...>& rhs);
template<typename _CharT, _CharT... _Chars>
constexpr bool
operator>(const basic_string_literal<_CharT, _Chars...>& lhs,
const _CharT* rhs);
template<typename _CharT, _CharT... _Chars>
constexpr bool
operator>=(const _CharT* lhs,
const basic_string_literal<_CharT, _Chars...>& rhs);
template<typename _CharT, _CharT... _Chars>
constexpr bool
operator>=(const basic_string_literal<_CharT, _Chars...>& lhs,
const _CharT* rhs);
// Stream inseration operator
template<typename _CharT, _CharT... _Chars>
inline std::ostream&
operator<<(std::ostream& os,
const basic_string_literal<_CharT, _Chars...>& str);
// Literal operator
template <typename _CharT, _CharT... _Chars>
inline constexpr basic_string_literal<_CharT, _Chars...>
operator""S();
template<char... _Chars>
using string_literal = basic_string_literal<char, _Chars...>;
template<char16_t... _Chars>
using u16string_literal = basic_string_literal<char16_t, _Chars...>;
template<char32_t... _Chars>
using u32string_literal = basic_string_literal<char32_t, _Chars...>;
template<wchar_t... _Chars>
using wstring_literal = basic_string_literal<wchar_t, _Chars...>;
} // namespace std