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std::bad_array_new_length

STD：不好[医]列阵[医]新[医]长度

Defined in header ​​
class bad_array_new_length;​(since C++11)

std::bad_array_new_length作为异常抛出的对象的类型。新表达式若要报告无效的数组长度，请执行以下操作。

1%29数组长度为负值。

2%29新数组的总大小将超过实现定义的最大值。

3%29初始化器-子句的数量超过要初始化的元素数。

只有第一个数组维度可以生成此异常；第一个维度以外的维度是常量表达式，在编译时进行检查。

二次

二次

继承图

成员函数

(constructor)constructs the bad_array_new_length object (public member function)

继承自STD：不好[医]异种

继承自STD：例外

成员函数

(destructor) virtualdestructs the exception object (virtual public member function of std::exception)
what virtualreturns an explanatory string (virtual public member function of std::exception)

注记

虚拟成员函数的覆盖。what()可由提供，但不是必需的。

例

三个条件std::bad_array_new_length应投：

二次

#include <iostream>
#include <new>
#include <climits>
 
int main()
{
    int negative = -1;
    int small = 1;
    int large = INT_MAX;
    try {
        new int[negative];           // negative size
        new int[small]{1,2,3};       // too many initializers
        new int[large][1000000];     // too large
    } catch(const std::bad_array_new_length &e) {
        std::cout << e.what() << '\n';
    }
}

二次

另见

operator newoperator new[]allocation functions (function)
bad_allocexception thrown when memory allocation fails (class)

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