DLL symbol identity

[Laeeth Isharc via Digitalmars-d]

On Monday, 11 May 2015 at 12:54:09 UTC, Benjamin Thaut wrote:
>> and why does it not map well to D ?
> D uses tons of templates everywhere. Even type information for 
> non templated types is generated on demand and stored in 
> comdats which can lead to duplicate symbols the same way it 
> does for templates. In D the dynamic cast is basically the 
> default and you have to force the compiler to not use a dynamic 
> cast if you care for performance.

Sorry for the rookie question, but my background is C rather than 
C++.  How do I force a static cast, and roughly order magnitude 
how big is the cost of a dynamic cast ?

Would you mean for example rather than casting a char[] to a 
string taking the address and casting the pointer?