Avoid calling constructor of member variable

Question

I have the following C++-class:

// Header-File
class A
{
    public:
    A();

    private:
    B m_B;
    C m_C;
};

// cpp-File
A::A()
: m_B(1)
{
    m_B.doSom         


        

Answer 1

Just use comma expressions:

A::A()
  : m_B(1)
  , m_c(m_B.doSomething(), m_B.doMore(), m_B.getSomeValue())
{
}

Obviously, as others have explained, m_B better be declared before m_C else m_B.doSomething() invokes undefined behavior.