V519. The 'x' variable is assigned values twice successively. Perhaps this is a mistake.

The analyzer detected a potential error related to assignment of a value two times successively to the same variable while the variable itself is not used between these assignments.

Consider this sample:

A = GetA();
A = GetB();

The fact that the 'A' variable is assigned values twice might signal an error. Most probably, the code should look this way:

A = GetA();
B = GetB();

If the variable is used between assignments, the analyzer considers this code correct:

A = 1;
A = A + 1;
A = Foo(A);

Let's see how such an error may look in practice. The following sample is taken from a real application where a user class CSize is implemented:

class CSize : public SIZE
  CSize(POINT pt) { cx = pt.x;  cx = pt.y; }

The correct version is the following:

CSize(POINT pt) { cx = pt.x;  cy = pt.y; }

Let's study one more example. The second line was written for the purpose of debugging or checking how text of a different color would look. And it seems that the programmer forgot to remove the second line then:

m_clrSample = GetSysColor(COLOR_WINDOWTEXT);
m_clrSample = RGB(60,0,0);

Sometimes the analyzer generates false alarms when writing into variables is used for the purpose of debugging. Here is an example of such code:

status = Foo1();
status = Foo2();

In this case, we may suppress false alarms using the "//-V519" comment. We may also remove meaningless assignments from the code. And the last thing. Perhaps this code is still incorrect, so we have to check the value of the 'status' variable.

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