c++ std::is_copy_constructible

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判断数据类型是不是含有拷贝构造函数。

// is_copy_constructible example
#include <iostream>
#include <type_traits>

struct A { };
struct B { B(B&&){} };
struct C { C(const C&){} };

int main() {
  std::cout << std::boolalpha;
  std::cout << "is_copy_constructible:" << std::endl;
  std::cout << "int: " << std::is_copy_constructible<int>::value << std::endl;
  std::cout << "A: " << std::is_copy_constructible<A>::value << std::endl;
  std::cout << "B: " << std::is_copy_constructible<B>::value << std::endl;
  std::cout << "C: " << std::is_copy_constructible<C>::value << std::endl;
  return 0;
}

输出:
is_copy_constructible:
int: true
A: true
B: false
C: true

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转载自blog.csdn.net/TH_NUM/article/details/86553097
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