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// stack::swap
#include <iostream> // std::cout
#include <stack> // std::stack
int main ()
{
std::stack<int> foo,bar;
foo.push (10); foo.push(20); foo.push(30);
bar.push (111); bar.push(222);
foo.swap(bar);
std::cout << "size of foo: " << foo.size() << '\n';
std::cout << "size of bar: " << bar.size() << '\n';
return 0;
}
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