uncaught_exception
仅当引发的异常当前进程,返回 true。
bool uncaught_exception( );
返回值
由于引发表达式,在完成引发表达式的求值返回之后 true 并在完成异常声明的初始化匹配的处理程序或调用 意外 之前。 具体而言,uncaught_exception 将返回 true,在调用从异常时调用堆栈展开的析构函数。 在计算机上,uncaught_exception 在Windows CE 5.00和更高版本只支持,包括Windows Mobile 2005平台。
示例
// exception_uncaught_exception.cpp
// compile with: /EHsc
#include <exception>
#include <iostream>
#include <string>
class Test
{
public:
Test( std::string msg ) : m_msg( msg )
{
std::cout << "In Test::Test(\"" << m_msg << "\")" << std::endl;
}
~Test( )
{
std::cout << "In Test::~Test(\"" << m_msg << "\")" << std::endl
<< " std::uncaught_exception( ) = "
<< std::uncaught_exception( )
<< std::endl;
}
private:
std::string m_msg;
};
// uncaught_exception will be true in the destructor
// for the object created inside the try block because
// the destructor is being called as part of the unwind.
int main( void )
{
Test t1( "outside try block" );
try
{
Test t2( "inside try block" );
throw 1;
}
catch (...) {
}
}
要求
标题: <exception>
命名空间: std