How can I push_back a struct into a vector?

struct point {

int x;

int y;

};

vector a;

a.push_back( ??? );

解決方案

point mypoint = {0, 1};

a.push_back(mypoint);

Or if you're allowed, give point a constructor, so that you can use a temporary:

a.push_back(point(0,1));

Some people will object if you put a constructor in a class declared with struct, and it makes it non-POD, and maybe you aren't in control of the definition of point. So this option might not be available to you. However, you can write a function which provides the same convenience:

point make_point(int x, int y) {

point mypoint = {x, y};

return mypoint;

}

a.push_back(make_point(0, 1));

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