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V639. One of closing ')' parentheses is…
Analyzer diagnostics
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V639. One of closing ')' parentheses is probably positioned incorrectly. Consider inspecting the expression for function call.

27 Nov 2018

The analyzer has detected a potential error: a suspicious function call is present which is followed by commas and expressions. Perhaps these expressions should be part of the function call.

This error usually occurs if a function is called inside a conditional operator and the function has arguments by default. In this case you may easily make a mistake writing a closing parenthesis in a wrong place. What is dangerous about these errors is that the code is compiled and executed without errors. Consider the following sample of incorrect code:

bool rTuple(int a, bool Error = true);
....
if (rTuple(exp), false)
{
 ....
}

The closing parenthesis put in a wrong place will cause two errors at once:

1) The 'Error' argument will equal 'true' when calling the 'rTuple' function, though the programmer meant it to be 'false'.

2) The comma operator ',' returns the value of the right part. It means that the (rTuple(exp), false) condition will always be 'false'

This is the fixed code:

if (rTuple(exp, false))
{
 ....
}

This diagnostic is classified as:

You can look at examples of errors detected by the V639 diagnostic.

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