Display the source code in dmd/expression.d from which this page was generated on github.

If you spot a problem with this page, click here to create a Bugzilla issue.

Quickly fork, edit online, and submit a pull request for this page. Requires a signed-in GitHub account. This works well for small changes. If you'd like to make larger changes you may want to consider using local clone.

Function `dmd.expression.CommaExp.allow`

If the argument is a CommaExp, set a flag to prevent deprecation messages


						
				static extern(C++) void allow
				(
				

				  Expression exp
				

				);

It's impossible to know from CommaExp.semantic if the result will be used, hence when there is a result (type != void), a deprecation message is always emitted. However, some construct can produce a result but won't use it (ExpStatement and for loop increment). Those should call this function to prevent unwanted deprecations to be emitted.

Parameters

Name	Description
exp	An expression that discards its result. If the argument is null or not a CommaExp, nothing happens.

Authors

Walter Bright

License

Boost License 1.0