MESSAGE
| DATE | 2011-06-13 |
| FROM | Ruben Safir
|
| SUBJECT | Subject: [NYLXS - HANGOUT] C++ Workshop Quiz
|
Looking at the following probram and without running it, what is its
output.
#include
class A
{
public:
explicit A(int n = 0) : m_n(n) { }
A(const A& a)
{
this->m_n = a.m_n;
++m_copy_calls;
}
public:
A& operator=(const A& a)
{
this->m_n = a.m_n;
return *this;
}
public:
static int m_copy_calls;
private:
int m_n;
};
int A::m_copy_calls = 0;
A f(const A& a) { return a; }
A g(const A a) { return a; }
int main()
{
A a;
std::cout << A::m_copy_calls;
A b = a;
std::cout << A::m_copy_calls;
A c(a);
std::cout << A::m_copy_calls;
b = g(c);
std::cout << A::m_copy_calls;
const A& d = f(c);
std::cout << A::m_copy_calls << std::endl;
return 0;
}
This is VERY similar to a question I saw on an employment examination.
Ruben
|
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