比较两个wstring时使用迭代器

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.

Answer 1

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

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

Answer 2

您可以使用std::wstring的c_str()方法以空终止的宽字符字符串访问基础存储。

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

Answer 3

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
}

Answer 4

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());