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以新的配置物件的存留期

物件以配置運算子便無法損毀時超出所定義的範圍。因為運算子傳回的指標,它會配置物件時,程式必須定義具有合適的領域,若要存取這些物件的指標。例如:

// expre_Lifetime_of_Objects_Allocated_with_new.cpp
// C2541 expected
int main()
{
    // Use new operator to allocate an array of 20 characters.
    char *AnArray = new char[20];

    for( int i = 0; i < 20; ++i )
    {
        // On the first iteration of the loop, allocate
        //  another array of 20 characters.
        if( i == 0 )
        {
            char *AnotherArray = new char[20];
        }
    }

    delete [] AnotherArray; // Error: pointer out of scope.
    delete [] AnArray;      // OK: pointer still in scope.
}

一次指標AnotherArray超出範圍,在範例中,物件不會再被刪除。

請參閱

參考

新運算子 (C++)