37 lines
766 B
C++
37 lines
766 B
C++
//
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// Created by light on 20-1-6.
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//
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#include <iostream>
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#include "structData.h"
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template<typename T, typename=std::string>
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struct hasSerialize : std::false_type {
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};
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template<typename T>
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struct hasSerialize<T, decltype(std::declval<T>().serialize())> : std::true_type {
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};
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template<class T>
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std::string serialize(const T &obj) {
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// 不加constexpr 报错：error: no member named 'serialize' in 'A'.
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if constexpr (hasSerialize<T>::value) // c++17特性
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return obj.serialize();
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else
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return to_string(obj);
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}
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int main() {
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A a;
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B b;
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C c;
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// The following lines work like a charm!
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std::cout << serialize(a) << std::endl;
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std::cout << serialize(b) << std::endl;
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std::cout << serialize(c) << std::endl;
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} |