Roland Conybeare
852dbe66dd
git-subtree-dir: xo-flatstring git-subtree-mainline:1eb4114722git-subtree-split:ebbe45e5e7
30 lines
719 B
C++
30 lines
719 B
C++
#include <string_view>
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#include <array>
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template <std::string_view const & ... Strings>
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struct sv_concat
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{
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static constexpr auto impl() noexcept {
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constexpr std::size_t n = (Strings.size() + ... + 0);
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std::array<char, n + 1> arr{};
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auto append = [i=0, &arr](const auto & s) mutable {
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for (auto c : s)
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arr[i++] = c;
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};
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(append(Strings), ...);
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arr[n] = '\0';
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return arr;
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}
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static constexpr auto arr = impl();
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static constexpr std::string_view value {
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arr.data(),
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arr.size() - 1
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};
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};
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template <std::string_view const & ... Strings>
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static constexpr auto concat_v = sv_concat<Strings...>::value;
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