Question

How to set vector capacity to hold vectors in memory in C++

Answer 1

#include <iostream>
#include <vector>

class Vertex {
public:
    float x, y, z;
    
    Vertex(float x, float y, float z) : x(x), y(y), z(z) {}
    
    Vertex (const Vertex& vertex) : x(vertex.x), y(vertex.y), z(vertex.z) {
        std::cout << "copy vertex" << "\n";
    }
};
    
int main() {
    std::vector<Vertex> ve;
    
    ve.reserve(3); // Set capacity
    
    ve.push_back(Vertex(3, 7, 0));
    ve.push_back(Vertex(2, 1, 0));
    ve.push_back(Vertex(8, 9, 6));
}



/*
run:

copy vertex
copy vertex
copy vertex

*/

 

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