Question

if for example I do:

FOO foo;
foovect.push_back(foo);

where FOO is a class with a default constructor.

Will the constructor be called only when foo is put on the stack, or is it called again when pushed into the std::vector?

Thanks

I’m doing:

OGLSHAPE::OGLSHAPE(void)
{
    glGenBuffersARB(GL_ARRAY_BUFFER_ARB,&ObjectVBOInt);

}

Answer 1

FOO foo; would call the constructor.
foovect.push_back(foo); would call the copy constructor.

#include <iostream>
#include <vector>

class FOO
{
public:
    FOO()
    {
        std::cout << "Constructor" << std::endl;
    }
    FOO(const FOO& _f)
    {
        std::cout << "Copy Constructor" << std::endl;
    }
};

int main()
{
    FOO foo;
    std::vector<FOO> foovect;
    foovect.push_back(foo);
}

Output for this:
Constructor
Copy Constructor