Re: Passing struct and struct[] into a template

[Taylor Gronka via Digitalmars-d-learn]

On Wednesday, 22 July 2015 at 05:02:59 UTC, Timon Gehr wrote:

template Uks(T){
T query(string q){
T result;
static if(is(T==S[],S)){
ulong test=result.length;
// append
S newResult;
result~=newResult;
}else{
// assign
}
return result;
}
}

void main(){
struct U_Struct{}
auto res1=Uks!(U_Struct).query("email");
auto res2=Uks!(U_Struct[]).query("email");
}


Oh that's phenomenal. Thanks!

For reference, the is() function can accept template parameters. 
More here, under isExpression

http://dlang.org/expression.html

Passing struct and struct[] into a template

[Taylor Gronka via Digitalmars-d-learn]

Hi,

I have a template function, and I want it to do something if the 
input variable is a list of structs, and something else if the 
input is a struct.


1) What's the best way to test this? I suppose I can call 
__traits(identifier, results) and look at the last two characters.
2) If `T` is a list of structs, how can I initialize a new struct 
so that I can append to `T`?


This is sort of how it might be done in python. I haven't 
implemented question 2 yet since I'm not sure how atm:


template Uks(T) {
T query(string q) {
T result;
try {
ulong test = result.length; // won't compile for 
non-list structs

// append to a struct list
T.subtype newResult; // is there a function like this?
result ~= newResult;
} catch {
// assign the struct members directly
}
return result;
}
}

I would like to call it like either of the following, depending 
on if I want 1 result or X results:

auto res = Uks!(U_Struct).query("email");
auto res = Uks!(U_Struct[]).query("email");

I'd be happy to hear better design methods.

Thanks

Re: oauth, Twitter, and std.net.curl

[Taylor Gronka via Digitalmars-d-learn]

You two are phenomenal! Thanks!

oauth, Twitter, and std.net.curl

[Taylor Gronka via Digitalmars-d-learn]

Hello,

I've picked up a web design project, and I would love to use 
vibe.d/dlang. I need to use oauth to search on a number of web 
api's, such as searching for Twitter tweets.


I tried using Adam's oauth (Thanks!). However, it doesn't appear 
support the validation needed for searching Twitter.

https://github.com/adamdruppe/arsd/blob/master/oauth.d


Now I'm looking at std.net.curl, and this is my thought: is 
HTTP.addRequestHeader(key, val) able to set the oauth 
authentication headers? It would look a bit odd, but if something 
like this works, then it wouldn't be difficult to code for each 
set of headers specifically:


auto client = HTTP("https://api.twitter.com";); // not sure if 
https should be set here or somewhere else

string bearerUrl = "https://api.twitter.com/oauth2/token";;
client.addRequestHeader("Authorization", "Basic 
eHZ6MWV2RlM0d0VFUFRHRUZQSEJvZzpMOHFxOVBaeVJnNmllS0dFS2hab2xHQzB2SldMdzhpRUo4OERSZHlPZw");

client.postData("grant_type=client_credentials");
client.perform();

(The above example is based on Step 2 of this page)
https://dev.twitter.com/oauth/application-only


Of course, the oauth headers look a bit different, but I imagine 
it being something like this:
client.addRequestHeader("Authorization", "OAuth2 token: 
\"string\", tokensecret: \"string\", appkey, \"string\" ...");

\\ not sure if that's how to escape quotes in dlang


Can I get some guidance on this? I would really like to use 
dlang, but I can't afford to be stuck on this for too long. I'd 
be happy to try and write a modification of Adam's code, but I 
lack experience, so it's a slow process for me.


I'd also be happy to write up little tutorials/blogposts about 
how I accomplish various tasks.


Thanks,