92 lines
3.2 KiB
C++
92 lines
3.2 KiB
C++
/* @file demangle.hpp */
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#pragma once
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#include <string>
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#include <string_view>
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#include <array> // std::array
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#include <utility> // std::index_sequence
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namespace xo {
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namespace reflect {
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template <std::size_t...Idxs>
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constexpr auto
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substring_as_array(std::string_view str,
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std::index_sequence<Idxs...> indexes)
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{
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//return std::array<char, indexes.size()+1>{str[Idxs]..., '\n'};
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return std::array<char, indexes.size()>{str[Idxs]...};
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} /*substring_as_array*/
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template <typename T> constexpr auto type_name_array() {
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#if defined(__clang__)
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constexpr auto prefix = std::string_view{"[T = "};
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constexpr auto suffix = std::string_view{"]"};
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constexpr auto function = std::string_view{__PRETTY_FUNCTION__};
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#elif defined(__GNUC__)
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constexpr auto prefix = std::string_view{"with T = "};
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constexpr auto suffix = std::string_view{"]"};
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constexpr auto function = std::string_view{__PRETTY_FUNCTION__};
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#elif defined(_MSC_VER)
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constexpr auto prefix = std::string_view{"type_name_array<"};
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constexpr auto suffix = std::string_view{">(void)"};
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constexpr auto function = std::string_view{__FUNCSIG__};
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#else
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# error type_name_array: Unsupported compiler
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#endif
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constexpr auto start = function.find(prefix) + prefix.size();
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constexpr auto end = function.rfind(suffix);
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//static_assert(start < end);
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constexpr auto name = function.substr(start, (end - start));
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constexpr auto ixseq = std::make_index_sequence<name.size()>{};
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return substring_as_array(name, ixseq);
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} /*type_name_array*/
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template <typename T>
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struct type_name_holder {
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static inline constexpr auto value = type_name_array<T>();
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};
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template <typename T>
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constexpr auto type_name() -> std::string_view
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{
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constexpr auto& value = type_name_holder<T>::value;
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return std::string_view{value.data(), value.size()};
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}
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#ifdef NOT_IN_USE
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template <std::string_view const&... Strs>
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struct join
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{
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// Join all strings into a single std::array of chars
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static constexpr auto impl() noexcept
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{
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constexpr std::size_t len = (Strs.size() + ... + 0);
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std::array<char, len + 1> arr{};
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auto append = [i = 0, &arr](auto const& s) mutable {
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for (auto c : s) arr[i++] = c;
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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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// Give the joined string static storage
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static constexpr auto arr = impl();
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// View as a std::string_view
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static constexpr std::string_view value {arr.data(), arr.size() - 1};
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};
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// Helper to get the value out
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template <std::string_view const&... Strs>
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static constexpr auto join_v = join<Strs...>::value;
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#endif
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} /*namespace reflect*/
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} /*namespace xo*/
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/* end demangle.hpp */
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