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C++ std::is_trivially_destructible用法及代码示例


<type_traits>头文件中提供了C++ STL的std::is_trivially_destructible模板。 C++ STL的std::is_trivially_denstructible模板用于检查T是否是普通可破坏类型。如果T是普通可破坏类型,则返回布尔值true;否则返回false。

头文件:

#include<type_traits>

模板类别:

template <class T>
struct is_trivially_destructible;

用法:

std::is_trivially_destructible<T>::value

参数:模板std::is_trivially_destructible接受单个参数T(Trait类),以检查T是否是普通可破坏类型。



返回值:该模板返回一个布尔变量,如下所示:

  • 正确:如果类型T是微不足道的类型。
  • False:如果类型T不是可轻易破坏的类型。

下面是说明C /C++中的std::is_trivially_destructible模板的程序:

程序1:

// C++ program to illustrate 
// std::is_trivially_destructible 
#include <bits/stdc++.h> 
#include <type_traits> 
using namespace std; 
  
// Declare structures 
struct Y { 
    // Constructor 
    Y(int, int){}; 
}; 
  
struct X { 
  
    // Destructor 
    ~X() noexcept(false) 
    { 
    } 
}; 
  
struct Z { 
    ~Z() = default; 
}; 
  
// Declare classes 
class A { 
    virtual void fn() {} 
}; 
  
// Driver Code 
int main() 
{ 
  
    cout << boolalpha; 
  
    // Check if int is trivially 
    // destructable or not 
    cout << "int:"
         << is_trivially_destructible<int>::value 
         << endl; 
  
    // Check if struct X is trivially 
    // destructable or not 
    cout << "struct X:"
         << is_trivially_destructible<X>::value 
         << endl; 
  
    // Check if struct Y is trivially 
    // destructable or not 
    cout << "struct Y:"
         << is_trivially_destructible<Y>::value 
         << endl; 
  
    // Check if struct Z is trivially 
    // destructable or not 
    cout << "struct Z:"
         << is_trivially_destructible<Z>::value 
         << endl; 
  
    // Check if class A is trivially 
    // destructable or not 
    cout << "class A:"
         << is_trivially_destructible<A>::value 
         << endl; 
  
    // Check if constructor Y(int, int) is 
    // trivially destructable or not 
    cout << "Constructor Y(int, int):"
         << is_trivially_destructible<Y(int, int)>::value 
         << endl; 
  
    return 0; 
}
输出:
int:true
struct X:false
struct Y:true
struct Z:true
class A:true
Constructor Y(int, int):false

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




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注:本文由纯净天空筛选整理自bansal_rtk_大神的英文原创作品 std::is_trivially_destructible in C++ with Examples。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。