• Dave P. (20/20) Dec 17 2020 In C, you can use a macro to get the source text of an expression
• FreeSlave (13/33) Dec 17 2020 Something like that?
• Dave P. (3/17) Dec 17 2020 Very cool! Where can I read about what an alias as a template
• Mike Parker (3/5) Dec 17 2020 https://dlang.org/spec/template.html#aliasparameters
• mw (2/22) Dec 17 2020 https://code.dlang.org/packages/jdiutil

Dave P. <dave287091 gmail.com> writes:

In C, you can use a macro to get the source text of an expression 
as a string. For example

#include <stdio.h>
#define PRINT_INT(x) printf(#x " = %d\n", x)

int main(){
     // prints "3 = 3"
     PRINT_INT(3);
     int x = 4;
     // prints "x = 4"
     PRINT_INT(x);
#define FOO 5
     // prints "FOO = 5"
     PRINT_INT(FOO);
#define BAR FOO
     // prints "BAR = 5"
     PRINT_INT(BAR);
     return 0;
}

Is there a feature of D that allows you to achieve a similar 
goal? I’ve used this in the past for logging for example.

FreeSlave <freeslave93 gmail.com> writes:

On Thursday, 17 December 2020 at 19:45:38 UTC, Dave P. wrote:
 In C, you can use a macro to get the source text of an 
 expression as a string. For example

 #include <stdio.h>
 #define PRINT_INT(x) printf(#x " = %d\n", x)

 int main(){
     // prints "3 = 3"
     PRINT_INT(3);
     int x = 4;
     // prints "x = 4"
     PRINT_INT(x);
 #define FOO 5
     // prints "FOO = 5"
     PRINT_INT(FOO);
 #define BAR FOO
     // prints "BAR = 5"
     PRINT_INT(BAR);
     return 0;
 }

 Is there a feature of D that allows you to achieve a similar 
 goal? I’ve used this in the past for logging for example.

Something like that?

import  std.stdio;

void print_int(alias n)()
{
     writeln(n.stringof~"=", n);
}

void main()
{
     int x = 42;
     print_int!(x);
     print_int!(7);
}

Dave P. <dave287091 gmail.com> writes:

On Thursday, 17 December 2020 at 21:24:40 UTC, FreeSlave wrote:
 On Thursday, 17 December 2020 at 19:45:38 UTC, Dave P. wrote:
 [...]

 Something like that?

 import  std.stdio;

 void print_int(alias n)()
 {
     writeln(n.stringof~"=", n);
 }

 void main()
 {
     int x = 42;
     print_int!(x);
     print_int!(7);
 }

Very cool! Where can I read about what an alias as a template 
parameter does?

Mike Parker <aldacron gmail.com> writes:

On Thursday, 17 December 2020 at 21:40:09 UTC, Dave P. wrote:

 Very cool! Where can I read about what an alias as a template 
 parameter does?

https://dlang.org/spec/template.html#aliasparameters

https://github.com/PhilippeSigaud/D-templates-tutorial

mw <mingwu gmail.com> writes:

On Thursday, 17 December 2020 at 19:45:38 UTC, Dave P. wrote:
 In C, you can use a macro to get the source text of an 
 expression as a string. For example

 #include <stdio.h>
 #define PRINT_INT(x) printf(#x " = %d\n", x)

 int main(){
     // prints "3 = 3"
     PRINT_INT(3);
     int x = 4;
     // prints "x = 4"
     PRINT_INT(x);
 #define FOO 5
     // prints "FOO = 5"
     PRINT_INT(FOO);
 #define BAR FOO
     // prints "BAR = 5"
     PRINT_INT(BAR);
     return 0;
 }

 Is there a feature of D that allows you to achieve a similar 
 goal? I’ve used this in the past for logging for example.

https://code.dlang.org/packages/jdiutil