📜  C++中的std :: is_destructible示例

📅  最后修改于: 2021-05-30 11:25:17             🧑  作者: Mango

< type_traits >头文件中提供了C++ STL的std :: is_destructible模板。 C++ STL的std :: is_destructible模板用于检查T是否可破坏。一个类称为可破坏类,其析构函数不会被删除,并且在派生类中可能会被访问。如果T是可销毁类型,则返回布尔值true,否则返回false。

头文件:

#include

模板类别:

template< class T >
struct is_destructible;

句法:

std::is_destructible::value

参数:模板std :: is_destructible接受单个参数T(特质类)以检查T是否为可破坏类型。

返回值:模板std :: is_destructible返回一个布尔变量,如下所示:

  • 正确:如果类型T是可破坏的类型。
  • False:如果类型T不是可破坏的类型。

下面是演示C++中std :: is_destructible的程序:

程序:

// C++ program to illustrate
// std::is_destructible
#include 
#include 
using namespace std;
  
// Declare a structures
struct X {
};
  
struct Y {
  
    // Destructors
    ~Y() = delete;
};
  
struct Z {
    ~Z() = default;
};
  
struct A : Y {
};
  
// Driver Code
int main()
{
  
    cout << boolalpha;
  
    // Check if int is destructible
    // or not
    cout << "int is destructible? "
         << is_destructible::value
         << endl;
  
    // Check if float is destructible
    // or not
    cout << "float is destructible? "
         << is_destructible::value
         << endl;
  
    // Check if struct X is
    // destructible or not
    cout << "struct X is destructible? "
         << is_destructible::value
         << endl;
  
    // Check if struct Y is
    // destructible or not
    cout << "struct Y is destructible? "
         << is_destructible::value
         << endl;
  
    // Check if struct Z is
    // destructible or not
    cout << "struct Z is destructible? "
         << is_destructible::value
         << endl;
  
    // Check if struct A is
    // destructible or not
    cout << "struct A is destructible? "
         << is_destructible::value
         << endl;
  
    return 0;
}
输出:
int is destructible? true
float is destructible? true
struct X is destructible? true
struct Y is destructible? false
struct Z is destructible? true
struct A is destructible? false

参考: http://www.cplusplus.com/reference/type_traits/is_destructible/

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