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Added std::type_info formatter (#3978)
* Added std::type_info formatter; * Reused std::type_info formatter in std::exception formatters; * Updated MSVC std::type_info outputting to exclude all class, struct and enum occurences.
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@ -416,6 +416,95 @@ template <typename Char> struct formatter<std::error_code, Char> {
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}
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};
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#if FMT_USE_RTTI
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namespace detail {
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template <typename Char, typename OutputIt>
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auto write_demangled_name(OutputIt out, const std::type_info& ti) -> OutputIt {
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# ifdef FMT_HAS_ABI_CXA_DEMANGLE
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int status = 0;
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std::size_t size = 0;
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std::unique_ptr<char, void (*)(void*)> demangled_name_ptr(
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abi::__cxa_demangle(ti.name(), nullptr, &size, &status), &std::free);
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string_view demangled_name_view;
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if (demangled_name_ptr) {
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demangled_name_view = demangled_name_ptr.get();
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// Normalization of stdlib inline namespace names.
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// libc++ inline namespaces.
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// std::__1::* -> std::*
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// std::__1::__fs::* -> std::*
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// libstdc++ inline namespaces.
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// std::__cxx11::* -> std::*
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// std::filesystem::__cxx11::* -> std::filesystem::*
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if (demangled_name_view.starts_with("std::")) {
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char* begin = demangled_name_ptr.get();
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char* to = begin + 5; // std::
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for (char *from = to, *end = begin + demangled_name_view.size();
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from < end;) {
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// This is safe, because demangled_name is NUL-terminated.
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if (from[0] == '_' && from[1] == '_') {
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char* next = from + 1;
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while (next < end && *next != ':') next++;
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if (next[0] == ':' && next[1] == ':') {
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from = next + 2;
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continue;
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}
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}
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*to++ = *from++;
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}
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demangled_name_view = {begin, detail::to_unsigned(to - begin)};
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}
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} else {
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demangled_name_view = string_view(ti.name());
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}
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return detail::write_bytes<Char>(out, demangled_name_view);
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# elif FMT_MSC_VERSION
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const string_view demangled_name(ti.name());
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for (std::size_t i = 0; i < demangled_name.size(); ++i) {
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auto sub = demangled_name;
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sub.remove_prefix(i);
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if (sub.starts_with("enum ")) {
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i += 4;
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continue;
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}
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if (sub.starts_with("class ") || sub.starts_with("union ")) {
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i += 5;
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continue;
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}
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if (sub.starts_with("struct ")) {
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i += 6;
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continue;
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}
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if (*sub.begin() != ' ') *out++ = *sub.begin();
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}
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return out;
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# else
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return detail::write_bytes<Char>(out, string_view(ti.name()));
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# endif
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}
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} // namespace detail
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FMT_EXPORT
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template <typename Char>
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struct formatter<std::type_info, Char // DEPRECATED! Mixing code unit types.
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> {
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public:
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FMT_CONSTEXPR auto parse(basic_format_parse_context<Char>& ctx)
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-> decltype(ctx.begin()) {
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return ctx.begin();
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}
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template <typename Context>
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auto format(const std::type_info& ti, Context& ctx) const
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-> decltype(ctx.out()) {
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return detail::write_demangled_name<Char>(ctx.out(), ti);
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}
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};
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#endif
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FMT_EXPORT
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template <typename T, typename Char>
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struct formatter<
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@ -441,65 +530,14 @@ struct formatter<
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auto format(const std::exception& ex, Context& ctx) const
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-> decltype(ctx.out()) {
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auto out = ctx.out();
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if (!with_typename_)
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return detail::write_bytes<Char>(out, string_view(ex.what()));
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#if FMT_USE_RTTI
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const std::type_info& ti = typeid(ex);
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# ifdef FMT_HAS_ABI_CXA_DEMANGLE
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int status = 0;
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std::size_t size = 0;
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std::unique_ptr<char, void (*)(void*)> demangled_name_ptr(
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abi::__cxa_demangle(ti.name(), nullptr, &size, &status), &std::free);
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string_view demangled_name_view;
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if (demangled_name_ptr) {
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demangled_name_view = demangled_name_ptr.get();
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// Normalization of stdlib inline namespace names.
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// libc++ inline namespaces.
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// std::__1::* -> std::*
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// std::__1::__fs::* -> std::*
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// libstdc++ inline namespaces.
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// std::__cxx11::* -> std::*
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// std::filesystem::__cxx11::* -> std::filesystem::*
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if (demangled_name_view.starts_with("std::")) {
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char* begin = demangled_name_ptr.get();
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char* to = begin + 5; // std::
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for (char *from = to, *end = begin + demangled_name_view.size();
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from < end;) {
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// This is safe, because demangled_name is NUL-terminated.
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if (from[0] == '_' && from[1] == '_') {
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char* next = from + 1;
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while (next < end && *next != ':') next++;
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if (next[0] == ':' && next[1] == ':') {
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from = next + 2;
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continue;
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}
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}
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*to++ = *from++;
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}
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demangled_name_view = {begin, detail::to_unsigned(to - begin)};
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}
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} else {
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demangled_name_view = string_view(ti.name());
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if (with_typename_) {
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out = detail::write_demangled_name<Char>(out, typeid(ex));
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*out++ = ':';
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*out++ = ' ';
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}
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out = detail::write_bytes<Char>(out, demangled_name_view);
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# elif FMT_MSC_VERSION
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string_view demangled_name_view(ti.name());
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if (demangled_name_view.starts_with("class "))
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demangled_name_view.remove_prefix(6);
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else if (demangled_name_view.starts_with("struct "))
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demangled_name_view.remove_prefix(7);
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out = detail::write_bytes<Char>(out, demangled_name_view);
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# else
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out = detail::write_bytes<Char>(out, string_view(ti.name())
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});
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# endif
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*out++ = ':';
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*out++ = ' ';
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return detail::write_bytes<Char>(out, string_view(ex.what()));
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#endif
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return detail::write_bytes<Char>(out, string_view(ex.what()));
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}
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};
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@ -300,6 +300,13 @@ TEST(std_test, exception) {
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#endif
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}
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#if FMT_USE_RTTI
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TEST(std_test, type_info) {
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EXPECT_EQ(fmt::format("{}", typeid(std::runtime_error)),
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"std::runtime_error");
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}
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#endif
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TEST(std_test, format_bit_reference) {
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std::bitset<2> bs(1);
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EXPECT_EQ(fmt::format("{} {}", bs[0], bs[1]), "true false");
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