W8013 Possible use of 'identifier' before definition (C++)

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(Command-line option to display warning: -wdef)

Your source file used the variable 'identifier' in an expression before it was assigned a value.

The compiler uses a simple scan of the program to determine this condition.

If the use of a variable occurs physically before any assignment, this warning will be generated.

Of course, the actual flow of the program can assign the value before the program uses it.