Question

include <vector>

using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
    vector<vector<int>> vecVecInts;

    return 0;
}

I have turned off Visual Studio 2008 language extension and compiled the above code without warning or errors.

I used to remember that we have to replace the following line

vector<vector<int>>

with

vector<vector<int> >

because the compiler at that time doesn’t recognize the >> in the end.

Question> When does C++ standard introduce this syntax sweeter?

Thank you

Answer 1

It was introduced in the most recent standard, C++11, §14.2/3:

When parsing a template-argument-list, the first non-nested > is taken as the ending delimiter
rather than a greater-than operator. Similarly, the first non-nested >> is treated as two consecutive but
distinct > tokens, the first of which is taken as the end of the template-argument-list and completes the
template-id.