On Friday, 14 April 2017 at 08:24:00 UTC, Johannes Pfau wrote:
I've got this code duplicated in quite some functions:
---------------------
[...]1
foreach (MethodType; overloads)
{
// function dependent code here
}
[...]2
--------------------
What's the idiomatic way to refactor / reuse this code fragment?
-- Johannes
Your options are at least the following two (both untested, but
should work):
Option 1: Template Mixins
---
mixin template Foo(alias API, Dg)
{
void foo()
{
[...]1
foreach (MethodType; overloads)
{
Dg(MethodType);
}
[...]2
}
}
mixin Foo!(API, (MethodType) {
// function dependent code here
});
foo();
---
Option 2: Code generation using CTFE
---
string genFoo(alias API, string justDoIt)
{
import std.array : appender;
auto code = appender!string;
code.put(`[...]1`);
code.put(`foreach (MethodType; overloads) {`);
code.put(justDoIt);
code put(`}`);
code.put(`[...]2`);
}
mixin(genFoo!(API, q{
// function dependent code here
})());
---
Personally, I'd consider the second approach to be idiomatic, but
YMMW.
