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c-class-templates.cpp
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c-class-templates.cpp
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#include <iostream>
#include <utility>
#include <string>
template<typename T>
class AddElements {
public:
template<typename ... Args>
[[nodiscard]] constexpr auto add(Args ... elem) const {return (elem + ...) + class_value;};
constexpr AddElements(T elem) : class_value{elem}{};
private:
T class_value;
};
template <>
class AddElements <std::string> {
public:
[[nodiscard]] std::string concatenate(std::string elem){
return class_value.append(std::move(elem));
};
AddElements() = default;
AddElements(std::string elem) : class_value{std::move(elem)}{};
AddElements(AddElements const& other) = default;
AddElements(AddElements && other) noexcept : class_value{std::move(other.class_value)} {other.class_value = std::string();};
AddElements& operator=(AddElements const& other) = default;
AddElements& operator=(AddElements && other) noexcept {
if (this == &other) return *this;
class_value = std::move(other.class_value);
other.class_value = std::string();
return *this;
};
virtual ~AddElements() noexcept = default;
private:
std::string class_value{};
};
template <typename T>
[[nodiscard]] auto testCase(std::istream & input) {
auto arg1 = T{};
auto arg2 = T{};
input >> arg1 >> arg2;
AddElements<T> testObj{arg1};
return testObj.add(arg2);
};
template <>
[[nodiscard]] auto testCase<std::string>(std::istream & input) {
auto arg1 = std::string{};
auto arg2 = std::string{};
input >> arg1 >> arg2;
AddElements<std::string> testObj{arg1};
return testObj.concatenate(arg2);
};
int main ()
{
//for some reasons next two lines are necessary to pass C++14 and later...
//HK servers are slow as fuck
std::ios_base::sync_with_stdio(false);
std::cin.tie(NULL);
auto test_type = std::string{};
auto no_of_tests = unsigned{};
std::cin >> no_of_tests;
for (auto i = unsigned{0}; i < no_of_tests; i++) {
std::cin >> test_type;
if (test_type == "float") {std::cout << testCase<float>(std::cin) << '\n';}
else if (test_type == "int") {std::cout << testCase<int>(std::cin) << '\n';}
else if (test_type == "string") {std::cout << testCase<std::string>(std::cin) << '\n';}
}
return 0;
}