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#include <iostream>
using namespace std;
struct VI // define the data structure to
{ // operate on
static size_t s_count;
typedef int value_type;
VI() = default;
VI(VI const &other)
{
(*this)[0] = other[0];
cout << "CC, count = " << s_count << '\n';
}
VI(VI &&tmp)
{
(*this)[0] = tmp[0];
cout << "MC, count = " << s_count << '\n';
}
int d_value = 0;
size_t size() const
{
return 1;
};
VI &operator=(VI const &other)
{
cout << "op=\n";
(*this)[0] = other[0];
return *this;
}
VI &operator+=(VI const &other)
{
cout << "op+=\n";
(*this)[0] += other[0];
return *this;
}
int &operator[](size_t idx)
{
++s_count;
return d_value;
}
int const &operator[](size_t idx) const
{
++s_count;
return d_value;
}
};
VI operator+(VI const &lhs, VI const &rhs)
{
cout << "copy +\n";
VI tmp{lhs};
tmp += rhs;
return tmp;
}
VI &&operator+(VI &&tmp, VI const &rhs)
{
cout << "move +\n";
tmp += rhs;
return move(tmp);
}
size_t VI::s_count;
int main()
{
VI a, b, c, d;
VI e = a + b + c + d;
cout << "# index computations: " << VI::s_count << '\n';
}
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