Correct way to initialize vector member variable

Question

// Method One
class ClassName
{
public:
    ClassName() : m_vecInts() {}

private:
    std::vector m_vecInts;
}

// Method Two
class ClassName
{
public:
    C         


        

Answer 1

It depends. If you want a size 0 vector, then you don't have to do anything. If you wanted, say, a size N vector fill of 42s then use the constructor initializer lists:

ClassName() : m_vecInts(N, 42) {}