I look to std.base64 module source.
And dont unerstand what is the "Base64" part in "Base64.encode(data)" example.
I see std.base64 module use template Base64Impl.
I see alias Base64 = Base64Impl!...
But down understand.
Base64 not module, not structure, not class?
Template Base64Impl shoud produce function?

I want create base32 encoder/decoder for example.
But i dont need template.
So how i can write Base32.encode()?
By creating class Base32 with encode() member.
By creating structute Base32 with encode() member.
Any other options?

Thanx.

On Sunday, 14 May 2017 at 20:04:07 UTC, zabruk70 wrote:
> I look to std.base64 module source.
> And dont unerstand what is the "Base64" part in "Base64.encode(data)" example.
> I see std.base64 module use template Base64Impl.
> I see alias Base64 = Base64Impl!...
> But down understand.
> Base64 not module, not structure, not class?

The full line is `alias Base64 = Base64Impl!('+', '/');`, which reads as (refer to [1][2]):
The symbol Base64 refers to the Base64Impl template instantiated with the template parameters '+' and '/'.

> Template Base64Impl shoud produce function?

I don't understand what you're trying to express here.
As Base64Impl's documentation states[3], it contains a generic Base64 implementation for which you can customize some of the encoding characters at compile time via template parameters.

>
> I want create base32 encoder/decoder for example.
> But i dont need template.
> So how i can write Base32.encode()?
> By creating class Base32 with encode() member.
> By creating structute Base32 with encode() member.
> Any other options?

You can create a base32 encoder however you like, D has lots of different ways you could approach this; you can even do it in a C way with two functions base32_encode / base32_decode. Just pick whatever you like.

PS: Please spellcheck.

[1] https://dlang.org/spec/declaration.html#alias
[2] https://dlang.org/spec/template.html
[3] https://github.com/dlang/phobos/blob/master/std/base64.d#L108

On Sunday, 14 May 2017 at 21:22:20 UTC, Moritz Maxeiner wrote:
> The full line is `alias Base64 = Base64Impl!('+', '/');`

Yes. When we use it like this:

  const(char)[] encoded = Base64.encode(data);

then template instantiated and produce ... what?

> I don't understand what you're trying to express here.

What kind of symbols (class name, structure name, type)
can be used with dot in D language?

What produced by template instantiation `Base64Impl!('+', '/')`
then i use alias `Base64`?

> You can create a base32 encoder however you like, D has lots of different ways you could approach this; you can even do it in a

But i want mimic std.base64 syntax.
I want to write something like

  string encoded = Base32.encode(data);

And i don't want to use template.

On Sunday, 14 May 2017 at 21:34:35 UTC, zabruk70 wrote:
> On Sunday, 14 May 2017 at 21:22:20 UTC, Moritz Maxeiner wrote:
>> The full line is `alias Base64 = Base64Impl!('+', '/');`
>
> Yes. When we use it like this:
>
>   const(char)[] encoded = Base64.encode(data);
>
> then template instantiated and produce ... what?

Have you read the language specification I linked to?
Base64 refers to a (fully) parametrized template. If you use the symbol Base64, you will access its instantiation; '.encode' then accesses the member "encode" in the scope of that template instance, which happens to be a function. That function then gets called with "data" as its argument and returns the encoded data.

>
>> I don't understand what you're trying to express here.
>
> What kind of symbols (class name, structure name, type)
> can be used with dot in D language?

Pretty much any symbol. Any type (or alias to one) will at least have properties[1] and any variable will be open to UFCS[2].

>
> What produced by template instantiation `Base64Impl!('+', '/')`
> then i use alias `Base64`?

I'm sorry, but I have no idea what you're trying to convey here.

>
>> You can create a base32 encoder however you like, D has lots of different ways you could approach this; you can even do it in a
>
> But i want mimic std.base64 syntax.
> I want to write something like
>
>   string encoded = Base32.encode(data);
>
> And i don't want to use template.

Then use a struct with static member functions:

struct Base32
{
    static [...] encode([...]) { [...] }
    static [...] decode([...]) { [...] }
}

[1] https://dlang.org/spec/property.html
[2] https://tour.dlang.org/tour/en/gems/uniform-function-call-syntax-ufcs