Mangling template

[Wusiki jeronii]

On Friday, 7 May 2021 at 08:24:15 UTC, Wusiki jeronii wrote:
> On Friday, 7 May 2021 at 07:36:40 UTC, evilrat wrote:
>> On Friday, 7 May 2021 at 06:17:32 UTC, Wusiki jeronii wrote:
>>> I get the error:
>>> Error: static variable `libdll` cannot be read at compile 
>>> time.
>>
>> Check how "libdll" and "Library" is defined, this error 
>> usually means you are forcing it to CTFE by reading or 
>> assigning it to enum, class member initializer, or any other 
>> compile time stuff.
>>
>>> How to redefine template? Need to point all functions by type 
>>> manually without a template?
>>
>> What do you mean by redefine template?
>
> Solved.
> ```d
> Library libdll;
> T abcd(T)(T a)
> {
>     T function(T) fun = cast(T function(T)) libdll.loadSymbol!(
>             T function(T))("dll.test");
>     return fun(a);
> }
>
> static this()
> {
>     libdll = Library("libs/libdll.so");
>     writeln(abcd!float(6.5f));
> }
> ```
> Thanks for your responses.

New problem.
I am getting the error:
```shell
object.Exception at source/app.d(67): libs/libdll.so: undefined 
symbol: _D3dll4testFfZf
```

But if I will address in my DLL in any place to my template the 
error disappears.
Example:
Compiles
```d
shared static this()
{
     writeln("libdll.so is loaded");
     writeln(test!float(7));
}
```
Does not compiles
```d
shared static this()
{
     writeln("libdll.so is loaded");
     //writeln(test!float(7));
}
```
It isn't a problem with pragma. 'cos even without pragma (by 
`_D3dll__T4testHTfZQjFNaNbNiNffZf`) it doesn't work if I will not 
point to explicit type.
Another example:
I will declare just another function in the DLL source file.
Works
```d
string fff()
{
     auto h = test!float(8);
     return "";
}
```
Doesn't work (same error with undefined symbol)
```d
string fff(T)()
{
     auto h = test!T(8);
     return "";
}
```
Looks like if I won't explicitly act need template it will not 
unload as a symbol after building. But it's the library!!! 
Library of functions. I don't need to address functions in the 
source code.
So with functions (non-template), there isn't such a problem.