Display the source code in dmd/dtemplate.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.dtemplate.TemplateInstance.isDiscardable`


						
				final extern(C++) bool isDiscardable();

Returns

true if the instances' innards are discardable.

The idea of this function is to see if the template instantiation can be 100% replaced with its eponymous member. All other members can be discarded, even in the compiler to free memory (for example, the template could be expanded in a region allocator, deemed trivial, the end result copied back out independently and the entire region freed), and can be elided entirely from the binary.

The current implementation affects code that generally looks like:

template foo(args...) {
    some_basic_type_or_string helper() { .... }
    enum foo = helper();
}

since it was the easiest starting point of implementation but it can and should be expanded more later.

Authors

Walter Bright

License

Boost License 1.0