Extending library functions

[simendsjo]

On Thursday, 18 October 2012 at 12:10:17 UTC, tn wrote:
> On Thursday, 18 October 2012 at 11:43:40 UTC, simendsjo wrote:
>> On Thursday, 18 October 2012 at 11:31:47 UTC, tn wrote:
>> (...)
>> You need to manually add std.math.exp2 to the overload set so 
>> importing external methods doesn't hijack your methods:
>> http://dlang.org/function.html#overload-sets
>>
>> alias std.math.exp2 exp2;
>
> Thanks, that clarifies quite a lot. Unfortunately my example 
> was too simplified, as my type is a template.
>
> This still does not work:
> --------------------
> import std.math;
>
> struct Lognum(T) {
> 	T lx;
> }
>
> T log(T)(Lognum!T x) {
> 	return x.lx;
> }
>
> alias std.math.log log;
>
> void main() {
> 	//assert(std.math.log(1.0) == 0.0);
> 	assert(log(1.0) == 0.0);
> 	Lognum!double x;
> 	x.lx = 0.0;
> 	assert(log(x) == 0.0);
> }
> --------------------

I don't think you can overload template methods with non-template 
methods:

void f(string i) {}
void f(T)(T i) if (is(T == double)) {}

void main(string[] args) {
     f(2.2);
}

Error: template ol.f(T) if (is(T == double)) conflicts with 
function ol.f at ol.d(1)