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75 lines
1.5 KiB
C++
75 lines
1.5 KiB
C++
#include <iostream>
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#include <string>
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#include <vector>
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using std::cout, std::endl, std::string, std::vector;
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template <typename T>
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class Ref {
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private:
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T* mPtr;
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public:
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Ref(T& t) {
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mPtr = &t;
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}
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Ref(Ref& t) {
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mPtr = t.mPtr;
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}
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Ref() {
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mPtr = nullptr;
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}
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T& get() {
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return *mPtr;
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}
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T operator=(const T& t) {
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new(mPtr) T{t};
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return *mPtr;
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}
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T operator+(const T& t) {
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return *mPtr + t;
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}
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T operator+=(const T& t) {
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*mPtr = *mPtr + t;
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return *mPtr;
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}
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T* operator->() {
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return mPtr;
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}
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template <typename U>
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friend std::ostream& operator<<(std::ostream& out, Ref<U> r);
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};
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template <typename T>
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std::ostream& operator<<(std::ostream& out, Ref<T> r) {
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out << *(r.mPtr);
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return out;
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}
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void toUpper(Ref<string> r) {
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for(size_t i = 0; i < r->size(); ++i)
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r.get()[i] = toupper(r.get()[i]);
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}
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int main() {
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int a = 10;
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Ref<int> ra = a;
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cout << ra << endl;
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string s = "Cat";
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Ref<string> rs = s;
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rs = "Mouse";
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rs += "Elephant";
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cout << rs << endl;
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cout << s << endl;
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toUpper(s);
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cout << s << endl;
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vector<string> animals {"Cat", "Dogs", "Elephants", "Worms"};
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vector<Ref<string>> refs {animals.begin(), animals.end()};
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for (int i = 0; i < refs.size(); ++i)
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cout << animals[i] << " ";
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cout << endl;
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}
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