C++ 如何将 vector::push_back()` 与结构一起使用？
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How to use vector::push_back()` with a struct?
提问by XCS
How can I push_backa structinto a vector?
哪能push_back一struct成矢量？
struct point {
int x;
int y;
};
std::vector<point> a;
a.push_back( ??? );
回答by Steve Jessop
point mypoint = {0, 1};
a.push_back(mypoint);
Or if you're allowed, give pointa constructor, so that you can use a temporary:
或者，如果允许，请提供point一个构造函数，以便您可以使用临时：
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:
如果您将构造函数放在用 声明的类中struct，有些人会反对，这使它成为非 POD，而且您可能无法控制point. 因此，您可能无法使用此选项。但是，您可以编写一个提供相同便利的函数：
point make_point(int x, int y) {
point mypoint = {x, y};
return mypoint;
}
a.push_back(make_point(0, 1));
回答by Wim
point p;
p.x = 1;
p.y = 2;
a.push_back(p);
Note that, since ais a vector of points (not pointers to them), the push_back will create a copy of your point struct -- so pcan safely be destroyed once it goes out of scope.
请注意，由于a是点向量（不是指向它们的指针），push_back 将创建点结构的副本——因此p一旦超出范围就可以安全地销毁。
回答by Rewd0n
struct point {
int x;
int y;
};
vector <point> a;
a.push_back( {6,7} );
a.push_back( {5,8} );
Use the curly bracket.
使用大括号。
回答by The Communist Duck
point foo; //initialize with whatever
a.push_back(foo);
