Function floatHexToDoubleNumber

lib/mathlib.cpp:497–505

Assuming a limited support of built-in hexadecimal floats (see C99, C++17) that is a fall-back implementation. Performance has been optimized WRT to heap activity, however the calculation part is not optimized.

// Assuming a limited support of built-in hexadecimal floats (see C99, C++17) that is a fall-back implementation.
// Performance has been optimized WRT to heap activity, however the calculation part is not optimized.
static double floatHexToDoubleNumber(const std::string& str)
{
    const std::size_t p = str.find_first_of("pP",3);
    const double factor1 = myStod(str, str.cbegin() + 2, str.cbegin()+p, 16);
    const bool suffix = (str.back() == 'f') || (str.back() == 'F') || (str.back() == 'l') || (str.back() == 'L');
    const double exponent = myStod(str, str.cbegin() + p + 1, suffix ? str.cend()-1:str.cend(), 10);
    const double factor2 = std::pow(2, exponent);
    return factor1 * factor2;
}

double MathLib::toDoubleNumber(const Token * tok)
{