On Sunday, 3 January 2016 at 14:49:59 UTC, tsbockman wrote:
On Sunday, 3 January 2016 at 10:55:05 UTC, AntonSotov wrote:
import std.container.rbtree;
class myClass {
string str;
}
int main()
{
auto tree = new RedBlackTree!myClass;
return 0;
}
Error: mutable method object.Object.opCmp is not callable
using a inout object
Error: template instance std.functional.binaryFun!("a < b",
"a", "b").binaryFun!(inout(myClass), myClass) error
instantiating
/////////////////////////////////////////
How to use RedBlackTree of the objects of of its class?
Anyway, it's not too hard if you understand what's going on,
and all of the functions I added are good things to have
anyway, because lots of generic code expects some or all of
them. But, the error messages aren't all that helpful if you
didn't already know most of that.
But as a beginner it is quite disappointing to write all of these
functions to just get it work.
Maybe i am a bad programmer, but i don't write and use the member
functions above that often.
I often use the 'less' in the template arguments to get such
things as comparison done, and implement these functions only if
i have to..
To get it work this should be enough:
import std.container.rbtree;
class myClass {
string str;
override string toString() const {
return "{myClass: " ~ str ~ "}"; }
}
void main()
{
auto tree = new RedBlackTree!(myClass, "a.str < b.str");
}
~ togrue
