Seems like it'd be a good idea to pre compute all of phobos for compile time computations, as they should be changing. That would drastically reduce using any of phobos for compile time computation.

On Sunday, 13 August 2017 at 19:47:37 UTC, Jerry wrote:
> Seems like it'd be a good idea to pre compute all of phobos for compile time computations, as they should be changing. That would drastically reduce using any of phobos for compile time computation.

You cannot do that.
The point of template code is that the user can change it from the outside.
There is no way to precompute the reaction to things that are yet to be realized.

The way compile time is saved here is by limiting the flexibility.

On Sunday, 13 August 2017 at 19:51:31 UTC, Stefan Koch wrote:
> On Sunday, 13 August 2017 at 19:47:37 UTC, Jerry wrote:
>> Seems like it'd be a good idea to pre compute all of phobos for compile time computations, as they should be changing. That would drastically reduce using any of phobos for compile time computation.
>
> You cannot do that.
> The point of template code is that the user can change it from the outside.
> There is no way to precompute the reaction to things that are yet to be realized.
>
> The way compile time is saved here is by limiting the flexibility.

There are ways to do it, not having to parse the code would make it faster on its own. Compiling 500 source files individually that starts and stops DMD is drastically slower than putting the 500 source files together and running DMD once. The tests that are run for DMD for example could be made to run much faster.