Function parse_complex

classic/example/fundamental/complex_number.cpp:30–55

////////////////////////////////////////////////////////////////////////// Our complex number micro parser //////////////////////////////////////////////////////////////////////////

//
///////////////////////////////////////////////////////////////////////////////
bool
parse_complex(char const* str, complex<double>& c)
{
    double rN = 0.0;
    double iN = 0.0;

    subrule<0> first;
    subrule<1> r;
    subrule<2> i;

    if (parse(str,

        //  Begin grammar
        (
            first = '(' >> r >> !(',' >> i) >> ')' | r,
            r = real_p[assign(rN)],
            i = real_p[assign(iN)]
        )
        ,
        //  End grammar

        space_p).full)
    {
        c = complex<double>(rN, iN);
        return true;
    }
    else
    {
        return false;