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57 lines
2.1 KiB
C++
57 lines
2.1 KiB
C++
#pragma once
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#include <array>
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#include <string_view>
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using namespace std::string_view_literals;
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namespace geode::utils {
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static constexpr const std::string_view sv_null = "\0";
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static constexpr const std::string_view sv_none = "";
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static constexpr const std::string_view sv_path = "/";
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// straight off https://stackoverflow.com/questions/38955940/how-to-concatenate-static-strings-at-compile-time
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template <std::string_view const& Separator, std::string_view const&... Strs>
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struct ConstStringJoin {
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static constexpr auto impl() noexcept {
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constexpr std::size_t len = (Strs.size() + ... + 0) + (sizeof...(Strs) - 1) * Separator.size();
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std::array<char, len + 1> arr{};
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auto append = [len, i = 0, &arr](auto const& s) mutable {
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for (auto c : s) arr[i++] = c;
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if (i < static_cast<int>(len - 1)) {
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for (auto c : Separator) arr[i++] = c;
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}
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};
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(append(Strs), ...);
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arr[len] = 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 {arr.data(), arr.size() - 1};
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};
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template <std::string_view const& Separator, std::string_view const&... Strs>
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static constexpr auto const_join_sep = ConstStringJoin<Separator, Strs...>::value;
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template <std::string_view const&... Strs>
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static constexpr auto const_join = ConstStringJoin<sv_none, Strs...>::value;
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template <std::string_view const&... Strs>
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static constexpr auto const_join_path = ConstStringJoin<
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sv_path, Strs...
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>::value;
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template <std::string_view const& Separator, std::string_view const&... Strs>
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static constexpr const char* const_join_sep_c_str = ConstStringJoin<
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Separator, Strs...
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>::value.data();
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template <std::string_view const&... Strs>
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static constexpr const char* const_join_c_str = ConstStringJoin<
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sv_none, Strs...
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>::value.data();
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template <std::string_view const&... Strs>
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static constexpr const char* const_join_path_c_str = ConstStringJoin<
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sv_path, Strs...
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>::value.data();
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}
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