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V6039. There are two 'if' statements wi…
Analyzer diagnostics
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V6039. There are two 'if' statements with identical conditional expressions. The first 'if' statement contains method return. This means that the second 'if' statement is senseless.

08 Aoû 2018

The analyzer has detected an issue when the 'then' part of the 'if' operator never gets control. It happens because there is another 'if' before which contains the same condition whose 'then' part contains the unconditional 'return' operator. It may signal both a logical error in the program and an unnecessary second 'if' operator.

Consider the following example of incorrect code:

if (l >= 0x06C0 && l <= 0x06CE) return true;
if (l >= 0x06D0 && l <= 0x06D3) return true;
if (l == 0x06D5) return true;                 // <=
if (l >= 0x06E5 && l <= 0x06E6) return true;
if (l >= 0x0905 && l <= 0x0939) return true;
if (l == 0x06D5) return true;                 // <=
if (l >= 0x0958 && l <= 0x0961) return true;
if (l >= 0x0985 && l <= 0x098C) return true;

In this case, the 'l == 0x06D5' condition is doubled, and we just need to remove one of them to fix the code. However, it may be that the value being checked in the second case should be different from the first one.

This is the fixed code:

if (l >= 0x06C0 && l <= 0x06CE) return true;
if (l >= 0x06D0 && l <= 0x06D3) return true;
if (l == 0x06D5) return true;
if (l >= 0x06E5 && l <= 0x06E6) return true;
if (l >= 0x0905 && l <= 0x0939) return true;
if (l >= 0x0958 && l <= 0x0961) return true;
if (l >= 0x0985 && l <= 0x098C) return true;

This diagnostic is classified as:

You can look at examples of errors detected by the V6039 diagnostic.

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