Question

I am having issues with the following snippet of code

    string const& symbol::at(int index) const {
    assert(index<symbol_data.vector::size());
    return symbol_data.vector::at(index);
    }

Here, symbol_data is a private member of the class and is a vector

::at is a member function in the symbol class that I have defined.

When I try compiling this code, I get the following error messsage:

    error: ‘template<class _Tp, class _Alloc> class std::vector’ used without template parameters

However, there is no error if I change the function prototype to

    string symbol::at(int index) {...}

Does anybody know how I can get STL vectors to work properly with const references?

Answer 1

Your code as I’m writing this:

string const& symbol::at(int index) const {
    assert(index<symbol_data.vector::size());
    return symbol_data.vector::at(index);
    }

Instead of symbol_data.vector:: write just symbol_data..

Cheers & hth.,