A strange charArray.ptr behavior

[Ali Çehreli]

On 12/2/20 12:20 PM, Ferhat Kurtulmuş wrote:
> given the function:
> 
> export void ceaser_enc(char* input, ref char* output);
> 
> this compiles:
>      char* sezar = (new char[65]).ptr;
>      ceaser_enc(key, sezar);
> 
> this does not compile:
> 
>      char[] sezar = new char[65];
>      ceaser_enc(key, sezar.ptr);
> 
> by yielding: "cannot pass rvalue argument cast(char*)sezar of type char* 
> to parameter ref char* output"
> 
> Why is sezar an rvalue in the second case?

Not 'sezar' but sezar.ptr is an rvalue. Imagine ptr() being a function 
that returns a value:

T* ptr() {
   // ...
}

That pointer is an rvalue and D disallows binding them to 'ref' parameters.

In the first case, 'sezar' is a local variable, which is an lvalue.

Ali