Re: Getting the source text of an expression
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
Re: Getting the source text of an expression
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?
Re: Getting the source text of an expression
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
#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
Re: Getting the source text of an expression
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
#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);
}
Getting the source text of an expression
In C, you can use a macro to get the source text of an expression
as a string. For example
#include
#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.
