size_t size;

int status;

char* undecorated = abi::__cxa_demangle(decorated, nullptr, &size, &status);

if (status != 0) {

std::string error_msg = "Could not demangle type name ";

error_msg += decorated;

throw std::logic_error(error_msg);

}

std::string result; // the undecorated typeid name

result.reserve(size);

const char* cstr = undecorated;

// filter unnecessary characters from undecorated

char c = *cstr;

while (c != '\0') {

if (c == ' ') {

char previous_c = result.empty() ? ' ' : *(result.rbegin());

// get next non-space character

for (c = *++cstr; c == ' '; c = *++cstr) { }

if (c != '\0') {

// skip whitespace unless it separates two alphanumeric

// characters (such as in "unsigned int")

if (isalnum(c) && isalnum(previous_c)) {

result += ' ';

result += c;

}

else {

result += c;

}

c = *++cstr;

}

}

else {

result += c;

c = *++cstr;

}

}

free(undecorated);

# ifdef __clang__

// replace "std::__1::" with "std::" (fixes strange clang names)

std::string needle = "std::__1::";

std::string fixed_string = "std::";

for (auto pos = result.find(needle); pos != std::string::npos; pos = result.find(needle)) {

result.replace(pos, needle.size(), fixed_string);

}

# endif

return result;