namespaces

std::istringstream input(
        "[first]\n"
        "a=  b\n"
        "b  =a\n"
        "c  =           c\n"
    );
std::istringstream input(
        "[first]  \n"
        "a=b    \n"
        "b=a               "
    );
std::istringstream input(
        "   [first]\n"
        " a=b\n"
        "    b=a"
    );