blob: d530a54b18e957c6a093a99aab47a52ff0fcb4d1 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
#pragma once
#include <array>
#include <string_view>
namespace saw {
/**
* Helper object which creates a templated string from the provided string
* literal. It guarantees compile time uniqueness and thus allows using strings
* in template parameters.
*/
template <class CharT, size_t N> class string_literal {
public:
constexpr string_literal(const CharT (&input)[N]) noexcept {
for (size_t i = 0; i < N; ++i) {
data[i] = input[i];
}
}
std::array<CharT, N> data{};
constexpr std::string_view view() const noexcept {
return std::string_view{data.data()};
}
constexpr bool
operator==(const string_literal<CharT, N> &) const noexcept = default;
template <class CharTR, size_t NR>
constexpr bool
operator==(const string_literal<CharTR, NR> &) const noexcept {
return false;
}
};
template <typename T, T... Chars>
constexpr string_literal<T, sizeof...(Chars)> operator""_key() {
return string_literal<T, sizeof...(Chars) + 1u>{Chars..., '\0'};
}
} // namespace saw
|
