Function invokeLambda

Bcore/src/main/cpp/Dobby/tests/catch.hpp:5768–5772

template <typename ArgType, typename L>
inline auto invokeLambda(L const &lambda, std::string const &arg) -> ParserResult {
  ArgType temp{};
  auto result = convertInto(arg, temp);
  return !result ? result : LambdaInvoker<typename UnaryLambdaTraits<L>::ReturnType>::invoke(lambda, temp);
}

template <typename L> struct BoundLambda : BoundValueRefBase {
  L m_lambda;