I read docs and can't understand what's wrong. Or I am do not understand it, or there is come mistake.

Let's look at function https://dlang.org/phobos/std_stdio.html#.File.byLine

auto byLine(Terminator = char, Char = char)(KeepTerminator keepTerminator = No.keepTerminator, Terminator terminator = '\x0a')

what does mean first groups of scope: (Terminator = char, Char = char) ?

The second one as I understand it's options symbol `=` mean that there is some default values, so if I will call function I can do not set them, so predefined values will be used.

Am I right? And If I do not want predefined I can pass my own like:
`byLine(No.keepTerminator, 'SomeLetter')`

for example: `file.byLine(No.keepTerminator, 'a')`

But when I compile simple example I am getting compilation error: `undefined identifier 'No'`

Where I am wrong?

On Thursday, 26 January 2017 at 17:38:59 UTC, Suliman wrote:
> I read docs and can't understand what's wrong. Or I am do not understand it, or there is come mistake.
>
> [...]

You have to import typecons.

On Thu, Jan 26, 2017 at 05:38:59PM +0000, Suliman via Digitalmars-d-learn wrote:
> I read docs and can't understand what's wrong. Or I am do not understand it, or there is come mistake.
> 
> Let's look at function https://dlang.org/phobos/std_stdio.html#.File.byLine
> 
> auto byLine(Terminator = char, Char = char)(KeepTerminator keepTerminator =
> No.keepTerminator, Terminator terminator = '\x0a')
> 
> what does mean first groups of scope: (Terminator = char, Char = char) ?

Those are compile-time parameters. You specify them in a compile-time argument list using the !(...) construct, for example:

	auto lines = File("myfile.txt")
		.byLine!(dchar, char)(Yes.keepTerminator, '\u263a');


T

-- 
If lightning were to ever strike an orchestra, it'd always hit the conductor first.

On Thursday, 26 January 2017 at 17:52:24 UTC, H. S. Teoh wrote:
> On Thu, Jan 26, 2017 at 05:38:59PM +0000, Suliman via Digitalmars-d-learn wrote:
>> I read docs and can't understand what's wrong. Or I am do not understand it, or there is come mistake.
>> 
>> Let's look at function https://dlang.org/phobos/std_stdio.html#.File.byLine
>> 
>> auto byLine(Terminator = char, Char = char)(KeepTerminator keepTerminator =
>> No.keepTerminator, Terminator terminator = '\x0a')
>> 
>> what does mean first groups of scope: (Terminator = char, Char = char) ?
>
> Those are compile-time parameters. You specify them in a compile-time argument list using the !(...) construct, for example:
>
> 	auto lines = File("myfile.txt")
> 		.byLine!(dchar, char)(Yes.keepTerminator, '\u263a');
>
>
> T

So I am right about others items about for example that `=` is optional?

On Thursday, 26 January 2017 at 18:42:29 UTC, Suliman wrote:
> On Thursday, 26 January 2017 at 17:52:24 UTC, H. S. Teoh wrote:
>> On Thu, Jan 26, 2017 at 05:38:59PM +0000, Suliman via Digitalmars-d-learn wrote:
>>> I read docs and can't understand what's wrong. Or I am do not understand it, or there is come mistake.
>>> 
>>> Let's look at function https://dlang.org/phobos/std_stdio.html#.File.byLine
>>> 
>>> auto byLine(Terminator = char, Char = char)(KeepTerminator keepTerminator =
>>> No.keepTerminator, Terminator terminator = '\x0a')
>>> 
>>> what does mean first groups of scope: (Terminator = char, Char = char) ?
>>
>> Those are compile-time parameters. You specify them in a compile-time argument list using the !(...) construct, for example:
>>
>> 	auto lines = File("myfile.txt")
>> 		.byLine!(dchar, char)(Yes.keepTerminator, '\u263a');
>>
>>
>> T
>
> So I am right about others items about for example that `=` is optional?

Why this code is work: `file.byLine(KeepTerminator.no, 'm')`

On Thu, Jan 26, 2017 at 06:47:21PM +0000, Suliman via Digitalmars-d-learn wrote:
> On Thursday, 26 January 2017 at 18:42:29 UTC, Suliman wrote:
> > On Thursday, 26 January 2017 at 17:52:24 UTC, H. S. Teoh wrote:
> > > On Thu, Jan 26, 2017 at 05:38:59PM +0000, Suliman via Digitalmars-d-learn wrote:
> > > > I read docs and can't understand what's wrong. Or I am do not understand it, or there is come mistake.
> > > > 
> > > > Let's look at function https://dlang.org/phobos/std_stdio.html#.File.byLine
> > > > 
> > > > auto byLine(Terminator = char, Char = char)(KeepTerminator
> > > > keepTerminator = No.keepTerminator, Terminator terminator =
> > > > '\x0a')
> > > > 
> > > > what does mean first groups of scope: (Terminator = char, Char =
> > > > char) ?
> > > 
> > > Those are compile-time parameters. You specify them in a compile-time argument list using the !(...) construct, for example:
> > > 
> > > 	auto lines = File("myfile.txt")
> > > 		.byLine!(dchar, char)(Yes.keepTerminator, '\u263a');
> > > 
> > > 
> > > T
> > 
> > So I am right about others items about for example that `=` is optional?
> 
> Why this code is work: `file.byLine(KeepTerminator.no, 'm')`

Yes, the `=` means the parameter has a default value. This applies to both compile-time parameters and runtime parameters. So:

	file.byLine(KeepTerminator.no);

is the same as:

	file.byLine!(char, char)(No.keepTerminator, '\x0a');


T

-- 
There are 10 kinds of people in the world: those who can count in binary, and those who can't.