digitalmars.D.learn - put string[] into a appender without loop?

AsmMan (3/3) Sep 21 2014 I'd like to copy an array string into a appender!string() but I

AsmMan (9/12) Sep 21 2014 call:

Vladimir Panteleev (6/18) Sep 21 2014 put(app, s);

AsmMan (6/30) Sep 21 2014 this give undefined identifier: 'put' error. (std.array is

Vladimir Panteleev (6/10) Sep 21 2014 No, I was just thinking aloud about how Appender could be

AsmMan (5/15) Sep 21 2014 Thanks, I was thinking std.array is enough

H. S. Teoh via Digitalmars-d-learn (11/14) Sep 21 2014 Try this:

monarch_dodra (6/21) Sep 22 2014 FYI, that's probably scary expensive in terms of

ketmar via Digitalmars-d-learn (8/11) Sep 21 2014 On Sun, 21 Sep 2014 23:41:56 +0000
ketmar via Digitalmars-d-learn (4/4) Sep 21 2014 On Mon, 22 Sep 2014 02:51:41 +0300
kiran kumari (3/6) Sep 24 2014 see more example

"AsmMan" <jckj33 gmail.com> writes:

I'd like to copy an array string into a appender!string() but I 
can't see how to do this without loop myself over the string 
array. Is there a native function or should I write it myself?

Sep 21 2014

"AsmMan" <jckj33 gmail.com> writes:

On Sunday, 21 September 2014 at 23:41:58 UTC, AsmMan wrote:
 I'd like to copy an array string into a appender!string() but I 
 can't see how to do this without loop myself over the string 
 array. Is there a native function or should I write it myself?

call:

auto app = appender!string();
	string[] s = ["foo", "baa"];
	app.put(s);

give a:

\src\phobos\std\conv.d(9,9): Error: static assert  
"immutable(char) cannot be emplaced from a string." (b)

How do I fix it?

Sep 21 2014

"Vladimir Panteleev" <vladimir thecybershadow.net> writes:

On Sunday, 21 September 2014 at 23:48:59 UTC, AsmMan wrote:
 On Sunday, 21 September 2014 at 23:41:58 UTC, AsmMan wrote:
 I'd like to copy an array string into a appender!string() but 
 I can't see how to do this without loop myself over the string 
 array. Is there a native function or should I write it myself?

 call:

 auto app = appender!string();
 	string[] s = ["foo", "baa"];
 	app.put(s);

 give a:

 \src\phobos\std\conv.d(9,9): Error: static assert  
 "immutable(char) cannot be emplaced from a string." (b)

 How do I fix it?

put(app, s);

This is not an ideal solution, since Appender may reallocate 
several times when appending the array items. Ideally, appender 
itself should take a range of strings, so that it can preallocate 
memory for them only once.

Sep 21 2014

"AsmMan" <jckj33 gmail.com> writes:

On Monday, 22 September 2014 at 00:09:22 UTC, Vladimir Panteleev 
wrote:
 On Sunday, 21 September 2014 at 23:48:59 UTC, AsmMan wrote:
 On Sunday, 21 September 2014 at 23:41:58 UTC, AsmMan wrote:
 I'd like to copy an array string into a appender!string() but 
 I can't see how to do this without loop myself over the 
 string array. Is there a native function or should I write it 
 myself?

 call:

 auto app = appender!string();
 	string[] s = ["foo", "baa"];
 	app.put(s);

 give a:

 \src\phobos\std\conv.d(9,9): Error: static assert  
 "immutable(char) cannot be emplaced from a string." (b)

 How do I fix it?

 put(app, s);

 This is not an ideal solution, since Appender may reallocate 
 several times when appending the array items. Ideally, appender 
 itself should take a range of strings, so that it can 
 preallocate memory for them only once.

this give undefined identifier: 'put' error. (std.array is 
already included, buffer.put(string) doesn't give same error)

The copy of an array doesn't happen often as string but do 
suggest to I want something else instead of appender?

Sep 21 2014

"Vladimir Panteleev" <vladimir thecybershadow.net> writes:

On Monday, 22 September 2014 at 00:18:03 UTC, AsmMan wrote:
 this give undefined identifier: 'put' error. (std.array is 
 already included, buffer.put(string) doesn't give same error)

You need to import std.range.

 The copy of an array doesn't happen often as string but do 
 suggest to I want something else instead of appender?

No, I was just thinking aloud about how Appender could be 
improved in the future.

To minimize allocations right now, you could write your own 
put-like function which calls Appender.reserve.

Sep 21 2014

"AsmMan" <jckj33 gmail.com> writes:

On Monday, 22 September 2014 at 00:30:44 UTC, Vladimir Panteleev 
wrote:
 On Monday, 22 September 2014 at 00:18:03 UTC, AsmMan wrote:
 this give undefined identifier: 'put' error. (std.array is 
 already included, buffer.put(string) doesn't give same error)

 You need to import std.range.

Thanks, I was thinking std.array is enough

 The copy of an array doesn't happen often as string but do 
 suggest to I want something else instead of appender?

 No, I was just thinking aloud about how Appender could be 
 improved in the future.

 To minimize allocations right now, you could write your own 
 put-like function which calls Appender.reserve.

this is not critical (for now, I'm not doing any optmization) but 
I'll save the idea.

Sep 21 2014

"H. S. Teoh via Digitalmars-d-learn" <digitalmars-d-learn puremagic.com> writes:

On Sun, Sep 21, 2014 at 11:41:56PM +0000, AsmMan via Digitalmars-d-learn wrote:
 I'd like to copy an array string into a appender!string() but I can't
 see how to do this without loop myself over the string array. Is there
 a native function or should I write it myself?

Try this:

	import std.array : appender;
	import std.algorithm : joiner, copy;

	string[] arr = ["ab", "cd", "efg"];
	auto app = appender!string();
	arr.joiner.copy(app);
	assert(app.data == "abcdefg");


T

-- 
One reason that few people are aware there are programs running the internet is
that they never crash in any significant way: the free software underlying the
internet is reliable to the point of invisibility. -- Glyn Moody, from the
article "Giving it all away"

Sep 21 2014

"monarch_dodra" <monarchdodra gmail.com> writes:

On Sunday, 21 September 2014 at 23:50:50 UTC, H. S. Teoh via 
Digitalmars-d-learn wrote:
 On Sun, Sep 21, 2014 at 11:41:56PM +0000, AsmMan via 
 Digitalmars-d-learn wrote:
 I'd like to copy an array string into a appender!string() but 
 I can't
 see how to do this without loop myself over the string array. 
 Is there
 a native function or should I write it myself?

 Try this:

 	import std.array : appender;
 	import std.algorithm : joiner, copy;

 	string[] arr = ["ab", "cd", "efg"];
 	auto app = appender!string();
 	arr.joiner.copy(app);
 	assert(app.data == "abcdefg");


 T

FYI, that's probably scary expensive in terms of 
encoding/decoding.

Using the "free" std.range.put should take care of everything, 
natively.

Sep 22 2014

ketmar via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> writes:

On Sun, 21 Sep 2014 23:41:56 +0000
AsmMan via Digitalmars-d-learn <digitalmars-d-learn puremagic.com>
wrote:

 I'd like to copy an array string into a appender!string() but I=20
 can't see how to do this without loop myself over the string=20
 array. Is there a native function or should I write it myself?

hm... '.put' should work. i.e.

  string s =3D `something`;
  auto ap =3D appender!string();
  ap.put(s);
  // now ap.data returns `something`

Sep 21 2014

ketmar via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> writes:

On Mon, 22 Sep 2014 02:51:41 +0300
ketmar via Digitalmars-d-learn <digitalmars-d-learn puremagic.com>
wrote:

sorry, forgot that. i misunderstood your question.

Sep 21 2014

"kiran kumari" <kiranfabzen gmail.com> writes:

On Sunday, 21 September 2014 at 23:41:58 UTC, AsmMan wrote:
 I'd like to copy an array string into a appender!string() but I 
 can't see how to do this without loop myself over the string 
 array. Is there a native function or should I write it myself?

see more example
http://techgurulab.com/course/java-quiz-online/

Sep 24 2014

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digitalmars.D.learn - put string[] into a appender without loop?