I have a question how I could combine template parameters deduction with setting default values for template parameters. I will start directly from a piece of code.

string decodeURICustom(string allowedSpecChars = null, bool formEncoding = false, T)(T source) pure
{
   //Some processing
}

I want parameter T be deduced from context (T will be string, dstring, etc)
And then I want to add some aliases with specialised arguments.

alias decodeURICustom!("!$&'()*+,;=") decodeURIHost;
alias encodeURICustom!("!$&'()*+,;=") encodeURIHost;

alias decodeURICustom!("!$&'()*+,;=:@/") decodeURIPath;
alias encodeURICustom!("!$&'()*+,;=:@/") encodeURIPath;

But when using decodeURICustom template directly I want to be able not set template arguments.

void main()
{
  string str = "http://www.dlang.org";
  string result = decodeURICustom(str);
}

How could I do this? Is it possible. The example above doesn't complie.

Of course I could create another template function.

string decodeURIHost(T)(T source)
{

}

> string decodeURIHost(T)(T source)
> {
>
> }
But I like it less and I still don't know how to combine template params deduction with setting second param.

string decodeURIHost(T, bool formEncoding)(T source) {}

On 3/23/14, Uranuz <neuranuz@gmail.com> wrote:
> I have a question how I could combine template parameters deduction with setting default values for template parameters. I will start directly from a piece of code.

You can use eponymous templates for this. E.g.:

-----
template decodeURICustom(string allowedSpecChars = null, bool
formEncoding = false)
{
    string decodeURICustom(T)(T source) pure
    {
        return "";
    }
}

alias decodeURICustom!("!$&'()*+,;=") decodeURIHost;

void main()
{
    string str    = "http://www.dlang.org";
    string result = decodeURICustom(str);
}
-----

On Sunday, 23 March 2014 at 11:15:13 UTC, Andrej Mitrovic wrote:
> On 3/23/14, Uranuz <neuranuz@gmail.com> wrote:
>> I have a question how I could combine template parameters
>> deduction with setting default values for template parameters. I
>> will start directly from a piece of code.
>
> You can use eponymous templates for this. E.g.:
>
> -----
> template decodeURICustom(string allowedSpecChars = null, bool
> formEncoding = false)
> {
>     string decodeURICustom(T)(T source) pure
>     {
>         return "";
>     }
> }
>
> alias decodeURICustom!("!$&'()*+,;=") decodeURIHost;
>
> void main()
> {
>     string str    = "http://www.dlang.org";
>     string result = decodeURICustom(str);
> }
> -----

Yes. I like it more that ivoking one function from another. But this trick not working in DMD 2.063 as I understand.

On Sun, Mar 23, 2014 at 12:23 PM, Uranuz <neuranuz@gmail.com> wrote:

> Yes. I like it more that ivoking one function from another. But this trick not working in DMD 2.063 as I understand.

Is there any reason to still use 2.063 (honest question)? The current one is 2.065 with .066 in alpha state. .063 is almost a year old.

On Sunday, 23 March 2014 at 12:43:35 UTC, Philippe Sigaud wrote:
> On Sun, Mar 23, 2014 at 12:23 PM, Uranuz <neuranuz@gmail.com> wrote:
>
>> Yes. I like it more that ivoking one function from another. But this trick
>> not working in DMD 2.063 as I understand.
>
> Is there any reason to still use 2.063 (honest question)? The current
> one is 2.065 with .066 in alpha state. .063 is almost a year old.

No reason. I just had ability to check it in .063 and noticed this fact. Now I use .064 because of some breaking changes in std.json. May be there will be some minor release to fix this (I hope). So I checked only .063, .064.