How to add to a vector of vectors

[ClydeWilliams]

In my program i'm trying to have a function that returns a possible set of moves for a knight chess piece to move based off of its current position. Here's what I have so far:

   int x1 = x+1;
	int x2 = x+2;
	int x3 = x-1;
	int x4 = x-2;

	int y1 = y+1;
	int y2 = y+2;
	int y3 = y-1;
	int y4 = y-2;

	
	
	vector<vector<int>> temp;
	

	if(x1 >= 0 && x1 < grid_.size())
	{
		if(y2 >= 0 && y2 < grid_.size())
		{
			temp.push_back(x1,y2); //here's the error
			return temp;
		}
	}

I want to return a vector of x,y coordinate, but the push_back only allows one argument. Any suggestions?

[vlad from moscow]

std::vector<std::pair<int, int>>temp;

temp.push_back( std::make_pair( x1, y2 ) );

or temp.emplace_back( x1, y2 );

A sample

#include <iostream>
#include <vector>
#include <utility>
 
int main()
{
    std::vector<std::pair<int, int>> v;
    
    v.emplace_back( 1, 1 );
    v.emplace_back( 2, 2 );
    
    for ( auto p : v ) std::cout << "< " << p.first 
                                 << ", " << p.second
                                 << " >\n";
}

EDIT: If you are using MS VC++ 2010 then the loop in the sample can be rewritten as

    for each ( auto p in v ) std::cout << "< " << p.first 
                                       << ", " << p.second
                                       << " >\n";