Function from_current_exception

include/boost/stacktrace/stacktrace.hpp:394–415

Returns a basic_stacktrace object containing a stacktrace captured at the point where the currently handled exception was thrown by its initial throw-expression (i.e. not a rethrow), or an empty basic_stacktrace object if: - the `boost_stacktrace_from_exception` library is not linked to the current binary, or - the initialization of stacktrace failed, or - stacktrace captures are not enabled for

    ///
    /// Implements https://wg21.link/p2370r1
    static basic_stacktrace<Allocator> from_current_exception(const allocator_type& alloc = allocator_type()) noexcept {
        // Matches the constant from implementation
        constexpr std::size_t kStacktraceDumpSize = 4096;

        const char* trace = nullptr;
#if defined(__GNUC__) && defined(__ELF__)
        if (impl::current_exception_stacktrace) {
            trace = impl::current_exception_stacktrace();
        }
#elif defined(BOOST_MSVC)
        trace = boost_stacktrace_impl_current_exception_stacktrace();
#endif

        if (trace) {
            try {
                return basic_stacktrace<Allocator>::from_dump(trace, kStacktraceDumpSize, alloc);
            } catch (const std::exception&) {
                // ignore
            }
        }
        return basic_stacktrace<Allocator>{0, 0, alloc};
    }
};

/// @brief Compares stacktraces for less, order is platform dependent.