semki...@gmail.com wrote:
Here is a small program, that traces construction and distruction of
class A objects.
If I use make_pair to insert in a map everything is OK.
If I insert using [], than objects with index 11, 7 and 3 will be
deleted twice and objects with indexes 10, 6 and 2 not deleted at
all. What is wrong ? I am new to standard library.
I use Sun Studio 10: C++ 5.7 Compiler
#include <map>
#include <iostream.h>
There is no <iostream.h>
#include <iostream>
and you don't have the necessary <string>:
#include <string>
using namespace std;
class A
{
public:
A() : i(0)
{
j = k++;
cout << "Con " << i << " " << j << "\n";
};
A(int l) : i(l)
{
j = k++;
cout << "Con_k " << i << " " << j << "\n";
};
~A()
{
cout << "Dest " << i << " " << j << "\n";
};
A(const A& a)
{
i = a.i;
j = k++;
cout << "Copy " << i << " " << j << "\n";
};
Add here:
A& operator=(const A& a)
{
cout << "Was " << i << ' ' << j << " -- now ";
i = a.i;
j = a.j;
cout << i << " " << j << "\n";
return *this;
}
int i;
int j;
static int k;
};
int A::k = 0;
int main()
{
cout << "1\n";
std::string s;
std::map<std::string, A> mp;
cout << "2\n";
s = "A";
mp[s] = A(1);
//mp.insert(make_pair(s, A(1)));
cout << "3\n";
s = "B";
//mp.insert(make_pair(s, A(2)));
mp[s] = A(2);
cout << "4\n";
s = "C";
mp[s] = A(3);
//mp.insert(make_pair(s, A(3)));
cout << "5\n";
}
V
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