Function expectEq

sample/parse_expr.cpp:14–22

template <typename T>
auto expectEq(T const& l, T const& r)
{
    if (l != r)
    {
        std::stringstream ss;
        ss << l << " != " << r;
        throw std::runtime_error{ss.str()};
    }
}

using namespace hspp;
using namespace hspp::parser;