• Dibyendu Majumdar (5/5) Feb 26 2016 Hi,
• BBasile (3/8) Feb 26 2016 Have you an example of what's failing right now to show ?
• Dibyendu Majumdar (10/15) Feb 26 2016 I am trying something like this:
• BBasile (12/16) Feb 26 2016 No you cannot because you would have to convert the values to
• BBasile (15/19) Feb 26 2016 Erratum! Actually you can, example:
• Dibyendu Majumdar (2/16) Feb 26 2016 Thank you!

Dibyendu Majumdar <d.majumdar gmail.com> writes:

Hi,

How do I use a double value in a mixin template that is 
generating string?

Thanks and Regards
Dibyendu

BBasile <b2.temp gmx.com> writes:

On Friday, 26 February 2016 at 11:03:43 UTC, Dibyendu Majumdar 
wrote:
 Hi,

 How do I use a double value in a mixin template that is 
 generating string?

 Thanks and Regards
 Dibyendu

Have you an example of what's failing right now to show ?

Dibyendu Majumdar <d.majumdar gmail.com> writes:

On Friday, 26 February 2016 at 11:07:28 UTC, BBasile wrote:
 On Friday, 26 February 2016 at 11:03:43 UTC, Dibyendu Majumdar 
 wrote:
 How do I use a double value in a mixin template that is 
 generating string?

 Have you an example of what's failing right now to show ?

I am trying something like this:

template MyTAlloc(int n_vars, double v) {
const char[] MyT = "MyT_init(cast(MyT *) alloca(alloc_size(" ~ 
n_vars ~ ")), " ~ n_vars ~ ", " ~ v ~ ")";
}

MyT *t = mixin(MyTAlloc!(2,5.0));

Error: incompatible types for (("MyT_init(cast(MyT *) 
alloca(alloc_size(" ~ cast(immutable(char))2 ~ ")), " ~ 
cast(immutable(char))2 ~ ", ") ~ (5.00000)): 'string' and 'double'

BBasile <b2.temp gmx.com> writes:

On Friday, 26 February 2016 at 11:13:08 UTC, Dibyendu Majumdar 
wrote:
 I am trying something like this:

 template MyTAlloc(int n_vars, double v) {
 const char[] MyT = "MyT_init(cast(MyT *) alloca(alloc_size(" ~ 
 n_vars ~ ")), " ~ n_vars ~ ", " ~ v ~ ")";

No you cannot because you would have to convert the values to 
string using std.conv.to or std.format.format(), but they don't 
work at compile time (see 
https://issues.dlang.org/show_bug.cgi?id=13568).

Ideally like this:

template MyTAlloc(int n_vars, double v) {
const char[] MyT = "MyT_init(cast(MyT *) alloca(alloc_size(" ~
to!string(n_vars) ~ ")), " ~ to!string(n_vars) ~ ", " ~ 
to!string(v) ~ ")";

But you can try with regular templates or mixin templates.

BBasile <b2.temp gmx.com> writes:

On Friday, 26 February 2016 at 11:26:51 UTC, BBasile wrote:
 No you cannot because you would have to convert the values to 
 string using std.conv.to or std.format.format(), but they don't 
 work at compile time (see 
 https://issues.dlang.org/show_bug.cgi?id=13568).

Erratum! Actually you can, example:

import std.stdio;

string foo(double a)()
{
     return "auto value = " ~ a.stringof ~ ";";
}

void main(string[] args)
{
     mixin(foo!0.1);
     writeln(value); // 0.1
     writeln(typeof(value).stringof); // double
}

So you have to use .stringof on the template argument.
Sorry for the previous answer.

Dibyendu Majumdar <d.majumdar gmail.com> writes:

On Friday, 26 February 2016 at 11:37:32 UTC, BBasile wrote:
 Erratum! Actually you can, example:

 import std.stdio;

 string foo(double a)()
 {
     return "auto value = " ~ a.stringof ~ ";";
 }

 void main(string[] args)
 {
     mixin(foo!0.1);
     writeln(value); // 0.1
     writeln(typeof(value).stringof); // double
 }

 So you have to use .stringof on the template argument.
 Sorry for the previous answer.

Thank you!