Function has_solution_concentration

src/CoolProp.cpp:140–143

    return (fluid_string.find('[') != std::string::npos && fluid_string.find(']') != std::string::npos);
}
bool has_solution_concentration(const std::string& fluid_string) {
    // If can find "-", expect mass fractions encoded as string
    return (fluid_string.find('-') != std::string::npos && fluid_string.find('%') != std::string::npos);
}

struct delim : std::numpunct<char>
{