• Zaheer Ahmed (6/6) Jul 17 2017 I am Developing and Operation System in D and when writing
• Adam D. Ruppe (9/10) Jul 17 2017 A lot of C and C++ knowledge will carry over to D, but it isn't
• Zaheer Ahmed (2/12) Jul 17 2017 Thank you It worked.
• Shachar Shemesh (6/18) Jul 17 2017 No, it shouldn't.
• Adam D. Ruppe (6/8) Jul 17 2017 I do not recommend explicitly casting. This specific case is a

Zaheer Ahmed <zaheercena gmail.com> writes:

I am Developing and Operation System in D and when writing 
writeln("Zaheer"); function, I got an ERROR.
Error: function kernel.dwriteln (char* str) is not callable using 
argument types (string)
I also tried Casting.
I Developed OS in C and C++ but first time stuck in types.

Adam D. Ruppe <destructionator gmail.com> writes:

On Monday, 17 July 2017 at 13:56:24 UTC, Zaheer Ahmed wrote:
 I Developed OS in C and C++ but first time stuck in types.

A lot of C and C++ knowledge will carry over to D, but it isn't 
exactly the same. D's strings are of type `string` which is 
another word for `immutable(char)[]`.

immutable means the contents never change. A `[]` slice is a 
pointer+length pair in a single type.


For your simple case, making it `const char*` should work... but 
you might want to read up on D's const and array types before 
going to much further.

Zaheer Ahmed <zaheercena gmail.com> writes:

On Monday, 17 July 2017 at 14:10:39 UTC, Adam D. Ruppe wrote:
 On Monday, 17 July 2017 at 13:56:24 UTC, Zaheer Ahmed wrote:
 I Developed OS in C and C++ but first time stuck in types.

 A lot of C and C++ knowledge will carry over to D, but it isn't 
 exactly the same. D's strings are of type `string` which is 
 another word for `immutable(char)[]`.

 immutable means the contents never change. A `[]` slice is a 
 pointer+length pair in a single type.


 For your simple case, making it `const char*` should work... 
 but you might want to read up on D's const and array types 
 before going to much further.

Thank you It worked.

Shachar Shemesh <shachar weka.io> writes:

On 07/17/2017 05:10 PM, Adam D. Ruppe wrote:
 On Monday, 17 July 2017 at 13:56:24 UTC, Zaheer Ahmed wrote:
 I Developed OS in C and C++ but first time stuck in types.

 
 A lot of C and C++ knowledge will carry over to D, but it isn't exactly 
 the same. D's strings are of type `string` which is another word for 
 `immutable(char)[]`.
 
 immutable means the contents never change. A `[]` slice is a 
 pointer+length pair in a single type.
 
 
 For your simple case, making it `const char*` should work...

No, it shouldn't.

Worst, it should work *most* of the time.

If you cast a D string to const char* may or may not null terminate the 
string.

Shachar

Adam D. Ruppe <destructionator gmail.com> writes:

On Tuesday, 18 July 2017 at 03:58:49 UTC, Shachar Shemesh wrote:
 If you cast a D string to const char* may or may not null 
 terminate the string.

I do not recommend explicitly casting. This specific case is a 
string literal, which is guaranteed to be null terminated and 
will implicitly cast.

In the cases where it is not null terminated, the compiler will 
reject it as a type error.