Use of an iterator when comparing two wstring

Question

I am iterating through a list and through a vector. Both are filled with wstring s.

I need to compare the two strings they are pointing at and find out if "wstring1" exists in another "wstring2".

n and k are the two iterators.

When I try:

   wcscmp(*n,*k);

it fails because a const wchar t is ecpected, if I understand the error message right...

How can I check if *n = "Hello you little fellow" contains *k="little" ?

Case does not matter.

PS: I do not want to use the BOOST lib.

@sehe: I don't. I'm leading the OP to the part where I either prove that this is homework, or persuade him/her to cast away the shackles of pointless restrictions based on misunderstandings. Why do you care why I care? — Lightness Races in Orbit, Oct 21 '11 at 11:30
Im 32, it's NOT homework... ;-) I'm not working on my machine right now.. — Lumpi, Oct 21 '11 at 11:35
@TomalakGeret'kal: I care because it doesn't work constructively. I know how you are _trying to_ get it to work constructively, but as it stands it just leads to repeated 'ugly comment streams' - making SO _less_ attractive IMO (besides for this question it is irrelevant, see the answers) — sehe, Oct 21 '11 at 11:36
@sehe: How ironic that you just took up so much space with this "ugly comment stream" that doesn't even have a constructive end goal. I don't care that the best solution doesn't involve Boost: I want to teach and help language newcomers to improve. That's why I'm here. Why are _you_ here? — Lightness Races in Orbit, Oct 21 '11 at 11:41
To lead the OP to an answer :) (and learning in the process) — sehe, Oct 21 '11 at 11:51

score 5 · Accepted Answer · answered Oct 21 '11 at 11:21

5

std::wstring n = L"Hello you little fello";
std::wstring k = L"little";

if ( n.find(k) != wstring::npos )
{
...
}

answered Oct 21 '11 at 11:21

AndersK

35,813
6
60
86

1

Note that you'd have to convert both strings to the same case to amke this insensitive to case differences (as the OP requested). See [this question](http://stackoverflow.com/questions/313970/stl-string-to-lower-case) for how to do that. – Björn Pollex Oct 21 '11 at 11:24

score 3 · Answer 2 · answered Oct 21 '11 at 11:22

3

You can use the c_str() method of the std::wstring to access the underlying storage as a null terminated wide-char string.

wcscmp(n->c_str(), k->c_str());

answered Oct 21 '11 at 11:22

Sylvain Defresne

42,429
12
75
85

IronMensan · Answer 3 · 2011-10-21T11:32:36.550

1

wstring lowN(*n);
wstring lowK(*k);

std::transform(lowN.begin(), lowN.end(), lowN.begin(), ::tolower); 
std::transform(lowK.begin(), lowK.end(), lowK.begin(), ::tolower); 

if ( wstring::npos != lowN->find(lowK) ) {
    // n contains k
}

edited Oct 21 '11 at 11:32

answered Oct 21 '11 at 11:21

IronMensan

6,761
1
26
35

score 0 · Answer 4 · answered Oct 21 '11 at 11:27

0

I see two possibilities:

1: Use the native find method of wstring:

n->find(*k);

2: If you want to use wcscmp

wcscmp(n->c_str(),k->c_str());

answered Oct 21 '11 at 11:27

simon

153
2
7

Use of an iterator when comparing two wstring

4 Answers4