uncaught_exception

Returns true only if a thrown exception is being currently processed.

bool uncaught_exception( );

Return Value

Returns true after completing evaluation of a throw expression and before completing initialization of the exception declaration in the matching handler or calling unexpected as a result of the throw expression. In particular, uncaught_exception will return true when called from a destructor that is being invoked during an exception unwind. On devices, uncaught_exception is only supported on Windows CE 5.00 and higher versions, including Windows Mobile 2005 platforms.

Example

// 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 (...) {
 }
}

In Test::Test("outside try block") In Test::Test("inside try block") In Test::~Test("inside try block") std::uncaught_exception( ) = 1 In Test::~Test("outside try block") std::uncaught_exception( ) = 0

Requirements

Header: <exception>

Namespace: std

See Also

Other Resources

<exception> Members