delete [] arr;

is equivalant to

delete arr[0]; delete arr[1]; ... delete arr[k];


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defination from msdn:
The delete operator destroys the object created with new by deallocating the memory associated with the object.
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however your array is array of primative type bool


now try this

Class Bool
{
public bool myBool;
};

Bool *flag2 = new Bool[8];
delete [] flat2;