• Victor Porton (9/9) Feb 25 2019 I want to create a string mixin based on a supplementary variable
• Rubn (9/18) Feb 25 2019 Probably the easiest way is just to move it into another function
• Benjamin Schaaf (12/21) Feb 25 2019 Your best bet is to just not declare anything in a mixin template
• Jonathan M Davis (7/16) Feb 25 2019 I'm not sure I quite follow what you mean, but if you're looking for nam...

Victor Porton <porton narod.ru> writes:

I want to create a string mixin based on a supplementary variable 
(name2 below):

Let we have something like:

mixin template X(string name) {
   immutable string name2 = '_' ~ name;
   mixin("struct " ~ name2 ~ "{ int i; }");
}

But it would create variable name2 inside X, which should not be 
created. How to solve this problem?

Rubn <where is.this> writes:

On Tuesday, 26 February 2019 at 00:07:54 UTC, Victor Porton wrote:
 I want to create a string mixin based on a supplementary 
 variable (name2 below):

 Let we have something like:

 mixin template X(string name) {
   immutable string name2 = '_' ~ name;
   mixin("struct " ~ name2 ~ "{ int i; }");
 }

 But it would create variable name2 inside X, which should not 
 be created. How to solve this problem?

Probably the easiest way is just to move it into another function 
outside so that it doesn't get mixed in with the mixin template.

  private string buildStructString(string name2) {
     return "struct " ~ name2 ~ "{ int i; }"
  }

  mixin template X(string name) {
    mixin(buildStructString("_" ~ name));
  }

Benjamin Schaaf <ben.schaaf gmail.com> writes:

On Tuesday, 26 February 2019 at 00:07:54 UTC, Victor Porton wrote:
 I want to create a string mixin based on a supplementary 
 variable (name2 below):

 Let we have something like:

 mixin template X(string name) {
   immutable string name2 = '_' ~ name;
   mixin("struct " ~ name2 ~ "{ int i; }");
 }

 But it would create variable name2 inside X, which should not 
 be created. How to solve this problem?

Your best bet is to just not declare anything in a mixin template 
that you don't want included:

mixin template X(string name) {
   mixin("struct _" ~ name ~ "{ int i; }");
}

Or don't use mixin templates:

template X(string name) {
   immutable string name2 = '_' ~ name;
   enum X = "struct " ~ name2 ~ "{ int i; }";
}
mixin(X!("foo"));

Jonathan M Davis <newsgroup.d jmdavisprog.com> writes:

On Monday, February 25, 2019 5:07:54 PM MST Victor Porton via Digitalmars-d-
learn wrote:
 I want to create a string mixin based on a supplementary variable
 (name2 below):

 Let we have something like:

 mixin template X(string name) {
    immutable string name2 = '_' ~ name;
    mixin("struct " ~ name2 ~ "{ int i; }");
 }

 But it would create variable name2 inside X, which should not be
 created. How to solve this problem?

I'm not sure I quite follow what you mean, but if you're looking for name2
to only exist at compile time rather than creating a variable, then make it
an enum. In general, that's what should be done with values that are only
intended for use during compile time.

- Jonathan M Davis