A strange charArray.ptr behavior

[Ferhat Kurtulmuş]

On Wednesday, 2 December 2020 at 21:01:22 UTC, Ali Çehreli wrote:
> 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

That makes sense. Thank you.