how to create a class , which size is 0?

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how to create a class , which size is 0?

If you create a class with array [0], you have done it.:D

Only in gcc compiler….in visual c++6.0, it is still 1.

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#include<iostream>
using namespace std;
class A
{
	char a[0];
};
int main()
{
	cout << sizeof(A);
	return 0;
}