On Monday, 15 August 2016 at 14:40:14 UTC, Chris Wright wrote:
You still haven't defined the term "design by introspection".
Some searching around says it's the pattern of:
template Foo(T) {
static if (is(typeof(T.bar)) {
// preferred implementation takes advantage of T.bar
} else {
// alternate (also correct) implementation
}
}
For instance, if T is an allocator and it has a `realloc`
method, the preferred implementation, which uses `realloc`,
will be chosen. Otherwise, the alternate implementation (which
might use a linked list to avoid reallocating) will be chosen.
There are is a ton of examples in Phobos, especially in
std.algorithm or std.range:
https://github.com/dlang/phobos/tree/master/std/algorithm
https://github.com/dlang/phobos/tree/master/std/range
The DTour also has a small Gem about it:
http://tour.dlang.io/tour/en/gems/traits
