mirror of https://github.com/xfarrow/lasd.git
136 lines
2.4 KiB
C++
136 lines
2.4 KiB
C++
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#include <iostream>
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using namespace std;
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template <typename Data>
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class A;
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template <typename Data>
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ostream& operator<< (ostream& outstr, const A<Data>& a);
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template <typename Data>
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class A {
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private:
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protected:
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uint size = 0;
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Data* str = nullptr;
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public:
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A() = default;
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A(uint num) : size(num) {
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cout << "A new object is created" << endl;
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str = new Data[num]();
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}
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~A() {
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delete[] str;
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cout << "The object is destructed" << endl;
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}
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Data& operator[](const uint idx) {
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return str[idx];
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}
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bool operator==(const A& obj) const noexcept {
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if (size == obj.size)
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{
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for (uint i = 0; i < size; i++)
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{
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if (str[i] != obj.str[i])
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{
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return false;
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}
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}
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return true;
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}
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return false;
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}
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//template <typename DataX>
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//friend ostream& operator<<(ostream&, const A<DataX>&);
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friend ostream& operator<< <>(ostream&, const A<Data>&);
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};
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template <typename Data>
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ostream& operator<< (ostream& outstr, const A<Data>& a) {
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for (uint i = 0; i < a.size; i++) { cout << i << ": '" << a.str[i] << "' "; }
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return outstr;
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}
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int main() {
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A<char> var1(2);
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A<char> var2(2);
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cout << "var1: " << var1 << endl;
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cout << "var2: " << var2 << endl;
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cout << "var1 ?= var2: " << (var1 == var2) << endl;
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var1[0] = 'x';
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cout << "var1: " << var1 << endl;
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cout << "var2: " << var2 << endl;
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cout << "var1 ?= var2: " << (var1 == var2) << endl;
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var2[1] = 'y';
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cout << "var1: " << var1 << endl;
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cout << "var2: " << var2 << endl;
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cout << "var1 ?= var2: " << (var1 == var2) << endl;
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var1[1] = 'y';
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var2[0] = 'x';
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cout << "var1: " << var1 << endl;
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cout << "var2: " << var2 << endl;
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cout << "var1 ?= var2: " << (var1 == var2) << endl;
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cout << endl << endl;
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A<int> var3(2);
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A<int> var4(2);
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cout << "var3: " << var3 << endl;
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cout << "var4: " << var4 << endl;
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cout << "var3 ?= var4: " << (var3 == var4) << endl;
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var3[0] = 10;
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cout << "var3: " << var3 << endl;
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cout << "var4: " << var4 << endl;
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cout << "var3 ?= var4: " << (var3 == var4) << endl;
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var4[1] = 5;
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cout << "var3: " << var3 << endl;
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cout << "var4: " << var4 << endl;
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cout << "var3 ?= var4: " << (var3 == var4) << endl;
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var3[1] = 5;
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var4[0] = 10;
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cout << "var3: " << var3 << endl;
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cout << "var4: " << var4 << endl;
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cout << "var3 ?= var4: " << (var3 == var4) << endl;
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return 0;
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}
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