Re: How do you find the struct types in a module? - getting Error: unknown

[aliak via Digitalmars-d-learn]

On Thursday, 13 February 2020 at 15:38:37 UTC, Steven 
Schveighoffer wrote:

On 2/13/20 9:47 AM, aliak wrote:

[...]


Not sure about your error, but here is a working version (don't 
use mixins, use __traits(getMember)):


import std.meta;
template ListOfStructs(alias mod)
{
enum isStruct(string m) = is(__traits(getMember, mod, m) == 
struct);

alias getMember(string m) = __traits(getMember, mod, m);
alias ListOfStructs = staticMap!(getMember, 
Filter!(isStruct, __traits(allMembers, mod)));

}

-Steve


It works without the mixin indeed! Thank you!

Re: How do you find the struct types in a module? - getting Error: unknown

[Steven Schveighoffer via Digitalmars-d-learn]

On 2/13/20 9:47 AM, aliak wrote:

Hi,

I'm trying to get a typed list of structs in my current module that 
matches certain criteria. Something like:


module mod;

struct X {}
struct Y {}

alias allTypes = ListOfTypes!mod;

But I'm having a bit of trouble. I have this so far:

template ListOfTypes(alias T) {
     import std.meta;
     enum isStruct(string m) = is(mixin(m) == struct);
     enum types = Filter!(isStruct, __traits(allMembers, T));
     alias toType(string m) = mixin(m);
     alias all = staticMap!(toType, types);
     alias CommandGroupsOf = all;
}

pragma(msg, ListOfTypes!mod);

But that causes an error I've never seen before:

Error: unknown, please file report on issues.dlang.org
onlineapp.d(30,1):    while evaluating `pragma(msg, 
CommandGroupsOf!(mod))`



Any workarounds or maybe insight in to the error?




Not sure about your error, but here is a working version (don't use 
mixins, use __traits(getMember)):


import std.meta;
template ListOfStructs(alias mod)
{
enum isStruct(string m) = is(__traits(getMember, mod, m) == struct);
alias getMember(string m) = __traits(getMember, mod, m);
alias ListOfStructs = staticMap!(getMember, Filter!(isStruct, 
__traits(allMembers, mod)));

}

-Steve

How do you find the struct types in a module? - getting Error: unknown

[aliak via Digitalmars-d-learn]

Hi,

I'm trying to get a typed list of structs in my current module 
that matches certain criteria. Something like:


module mod;

struct X {}
struct Y {}

alias allTypes = ListOfTypes!mod;

But I'm having a bit of trouble. I have this so far:

template ListOfTypes(alias T) {
import std.meta;
enum isStruct(string m) = is(mixin(m) == struct);
enum types = Filter!(isStruct, __traits(allMembers, T));
alias toType(string m) = mixin(m);
alias all = staticMap!(toType, types);
alias CommandGroupsOf = all;
}

pragma(msg, ListOfTypes!mod);

But that causes an error I've never seen before:

Error: unknown, please file report on issues.dlang.org
onlineapp.d(30,1):while evaluating `pragma(msg, 
CommandGroupsOf!(mod))`



Any workarounds or maybe insight in to the error?