Function getFunction1

tests/backend/gsl/ExpressionParserTest.cpp:8–17

namespace {
func_t1 getFunction1(const QString& s) {
	const QString functionName(s);
	for (int i = 0; i < _number_functions; i++) {
		if (functionName == QLatin1String(_functions[i].name)) {
			if (_functions[i].argc == 1)
				return std::get<func_t1>(_functions[i].fnct);
		}
	}
	return nullptr;
}

func_t2 getFunction2(const QString& s) {
	const QString functionName(s);