On Saturday, 9 January 2021 at 20:39:26 UTC, Ali Çehreli wrote:
On 1/9/21 12:35 PM, Ali Çehreli wrote:
> alias lightLoadOperation = memoize!heavyLoadOperation;
>
> const l = lightLoadOperation();
Well, that doesn't work the way you want but this does:
if (args.length == 1) {
writefln!"Using lazy variable: %s %s"(lightLoadOperation(),
lightLoadOperation());
}
No matter how many times you call lightLoadOperation, it will
be called just once (which can be configured with maxSize):
https://dlang.org/library/std/functional/memoize.html
Ali
In case of a function that takes no arguments ever, using memoize
may add memory overhead and something like this:
bool loaded = false;
T heavyLoadOperation() {
if(!loaded) {
// ... heavy operation.
loaded = true;
}
return value;
}
can actually be better in terms of memory usage? I thought the
lazy keyword could somehow help here but I think the way to go is
is just use a flag, such as loaded bool variable.
