32 lines
588 B
C++
32 lines
588 B
C++
#include <iostream>
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#include <ostream>
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// requires C++23 to compile
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class A {
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long long counter = 0;
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public:
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A() : counter{0} {}
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A operator()() {
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A ret = *this;
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ret.counter++;
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return ret;
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}
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// requires C++23 to compile
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A operator[](int _ = 0) {
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A ret = *this;
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ret.counter--;
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return ret;
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}
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friend std::ostream &operator<<(std::ostream &lhs, A const &rhs) {
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lhs << rhs.counter;
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return lhs;
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}
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};
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int main(void) {
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A a;
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std::cout << a[] << std::endl;
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std::cout << a[]() << std::endl;
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std::cout << a[]()() << std::endl;
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return 0;
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}
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