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std::nothrow

STD：不扔

Defined in header ​​
extern const std::nothrow_t nothrow;​​

std::nothrow是类型的常数。std::nothrow_t用于消除抛出和不抛的过载的歧义。分配函数...

例

二次

#include <iostream>
#include <new>
 
int main()
{
    try {
        while (true) {
            new int[100000000ul];   // throwing overload
        }
    } catch (const std::bad_alloc& e) {
        std::cout << e.what() << '\n';
    }
 
    while (true) {
        int* p = new(std::nothrow) int[100000000ul]; // non-throwing overload
        if (p == nullptr) {
            std::cout << "Allocation returned nullptr\n";
            break;
        }
    }
}

二次

产出：

二次

std::bad_alloc
Allocation returned nullptr

二次

另见

nothrow_ttag type used to select an non-throwing allocation function (class)
operator newoperator new[]allocation functions (function)

 © cppreference.com

在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。

http：//en.cppreference.com/w/cpp/Memory/new/nopo

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