digitalmars.D.learn - define new types within templates
- teo (26/26) Dec 29 2009 There was a way to define new types within templates and I think that I
- Phil Deets (22/48) Dec 29 2009 Did you try string mixins? Maybe something like this untested code:
- grauzone (17/47) Dec 29 2009 I don't know for what you're asking, but there's absolutely no need to
- BCS (9/38) Dec 29 2009 what I would do is this:
There was a way to define new types within templates and I think that I have seen that demonstrated here in the newsgroups, but cannot find it now. Can someone help me please? I would like to do something like this: template MyTemplate(T) { struct T ~ "Struct" // define FooStruct structure { int x; } class T ~ "Class" // define FooClass class { void bar(T ~ "Struct" t) { // ... } } } void main() { mixin MyTemplate!("Foo"); FooStruct t; FooClass f = new FooClass(); f.bar(t); } Hopefully I am not mistaken.
Dec 29 2009
On Tue, 29 Dec 2009 17:44:18 -0500, teo <teo.ubuntu.remove yahoo.com> wrote:There was a way to define new types within templates and I think that I have seen that demonstrated here in the newsgroups, but cannot find it now. Can someone help me please? I would like to do something like this: template MyTemplate(T) { struct T ~ "Struct" // define FooStruct structure { int x; } class T ~ "Class" // define FooClass class { void bar(T ~ "Struct" t) { // ... } } } void main() { mixin MyTemplate!("Foo"); FooStruct t; FooClass f = new FooClass(); f.bar(t); } Hopefully I am not mistaken.Did you try string mixins? Maybe something like this untested code: template MyTemplate(T) { mixin (CtfeReplace(q{ struct _T_Struct { int x; } }, "_T_", T.stringof)); mixin (CtfeReplace(q{ class _T_Class { void bar(_T_Struct t) { // ... } } }, "_T_", T.stringof)); } Sorry if this is a duplicate post. I attempted to cancel my earlier post.
Dec 29 2009
teo wrote:There was a way to define new types within templates and I think that I have seen that demonstrated here in the newsgroups, but cannot find it now. Can someone help me please? I would like to do something like this: template MyTemplate(T) { struct T ~ "Struct" // define FooStruct structure { int x; } class T ~ "Class" // define FooClass class { void bar(T ~ "Struct" t) { // ... } } } void main() { mixin MyTemplate!("Foo"); FooStruct t; FooClass f = new FooClass(); f.bar(t); } Hopefully I am not mistaken.I don't know for what you're asking, but there's absolutely no need to use string mixins (see Trass3r's reply). Instead you can just define a type inside the template, and then access it by instantiating it: template MyTemplate(T) { struct Struct { T x; } } void main() { MyTemplate!(int).Struct t; t.x = 123; } You can use mixin MyTemplate!(int); to bring "Struct" into the module namespace, and you can use e.g. "alias MyTemplate!(int) IntStruct;" to save typing.
Dec 29 2009
Hello teo,There was a way to define new types within templates and I think that I have seen that demonstrated here in the newsgroups, but cannot find it now. Can someone help me please? I would like to do something like this: template MyTemplate(T) { struct T ~ "Struct" // define FooStruct structure { int x; } class T ~ "Class" // define FooClass class { void bar(T ~ "Struct" t) { // ... } } } void main() { mixin MyTemplate!("Foo"); FooStruct t; FooClass f = new FooClass(); f.bar(t); } Hopefully I am not mistaken.what I would do is this: template MyTemplate(char[] name) { struct S { int x; } class C { ... } // put the minimum you can in the string mixin. mixin ("alias S "~name~"Struc; alias C "~name~"Class;"); }
Dec 29 2009