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std::underflow_error

STD：：地下水流[医]误差

Defined in header ​​
class underflow_error;​​

定义要作为异常抛出的对象类型。它可用于报告算术下流量误差%28，即计算结果为低于正常浮点值%29的情况。

标准库组件不会抛出此异常%28数学函数，按math_errhandling29%。然而，第三方库使用这个。例如，助教数学抛出std::underflow_error如果boost::math::policies::throw_on_error启用%28默认设置%29。

二次

二次

继承图

成员函数

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

STD：：地下水流[医]错误：：底流[医]误差

explicit underflow_error( const std::string& what_arg (1)​
explicit underflow_error( const char* what_arg (2)(since C++11)

构造异常对象what_arg作为解释性字符串，可以通过what()...

因为复制std::exception不允许抛出异常，此消息通常作为单独分配的引用计数字符串存储在内部。这也是为什么没有构造函数std::string&&：：无论如何，它必须复制内容。

参数

what_arg-explanatory string

例外

可抛std::bad_alloc...

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)

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