65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
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//
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// Created by jedi on 23.07.21.
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//
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#ifdef __cplusplus
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template<size_t S>
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using size=std::integral_constant<size_t, S>;
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template<class T, size_t N>
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constexpr size<N> length( T const(&)[N] ) { return {}; }
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template<class T, size_t N>
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constexpr size<N> length( std::array<T, N> const& ) { return {}; }
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template<class T>
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using length_t = decltype(length(std::declval<T>()));
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constexpr size_t string_size() { return 0; }
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template<class...Ts>
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constexpr size_t string_size( size_t i, Ts... ts ) {
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return (i?i-1:0) + string_size(ts...);
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}
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template<class...Ts>
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using string_length=size< string_size( length_t<Ts>{}... )>;
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template<class...Ts>
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using combined_string = std::array<char, string_length<Ts...>{}+1>;
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template<class Lhs, class Rhs, unsigned...I1, unsigned...I2>
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constexpr const combined_string<Lhs,Rhs>
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concat_impl( Lhs const& lhs, Rhs const& rhs, seq<I1...>, seq<I2...>)
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{
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// the '\0' adds to symmetry:
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return {{ lhs[I1]..., rhs[I2]..., '\0' }};
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}
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template<class Lhs, class Rhs>
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constexpr const combined_string<Lhs,Rhs>
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concat(Lhs const& lhs, Rhs const& rhs)
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{
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return concat_impl(
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lhs, rhs,
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gen_seq<string_length<Lhs>{}>{},
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gen_seq<string_length<Rhs>{}>{}
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);
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}
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template<class T0, class T1, class... Ts>
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constexpr const combined_string<T0, T1, Ts...>
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concat(T0 const&t0, T1 const&t1, Ts const&...ts)
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{
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return concat(t0, concat(t1, ts...));
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}
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template<class T>
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constexpr const combined_string<T>
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concat(T const&t) {
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return concat(t, "");
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}
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constexpr const combined_string<>
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concat() {
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return concat("");
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}
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#endif
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