string to lowercase
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I know about char* _strlwr(char*) but what I want is to be able to use this with a string variable, like:
string strg;
I tried it but it gives me a "cannot convert class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > to char*" error.
What can I do?
Try the boost string algorithm library, which will give you this plus a lot of other useful stuff. Or if you want quick and dirty, just do myString = std::tolower(myString) for every element of the string (or perhaps use a std:: algorithm such as for_each).
[Edit: Oops, forgot about std::transform().]
[Edited by - jyk on March 28, 2006 11:14:34 AM]
[Edit: Oops, forgot about std::transform().]
[Edited by - jyk on March 28, 2006 11:14:34 AM]
Edit: See jflanglois post re: using STL's transform function to convert case.
For what it's worth, here are a couple of functions which you may or may not also need in the future:
wsts - converts a std::wstring to std::string (as best it can, of course)
stws - converts a std::string to std::wstring
[Edited by - taby on March 28, 2006 11:18:55 AM]
For what it's worth, here are a couple of functions which you may or may not also need in the future:
wsts - converts a std::wstring to std::string (as best it can, of course)
stws - converts a std::string to std::wstring
string wsts(const basic_string<wchar_t> &src_string){ size_t src_len = src_string.length(); if(src_len == 0) return ""; char *buf = new(std::nothrow) char[src_len + 1]; if(buf == 0) return ""; wcstombs(buf, src_string.c_str(), src_len); buf[src_len] = '\0'; string final_string = buf; if(buf != 0) delete [] buf; return final_string;}basic_string<wchar_t> stws(const string &src_string){ size_t src_len = src_string.length(); if(src_len == 0) return L""; wchar_t *buf = new(std::nothrow) wchar_t[src_len + 1]; if(buf == 0) return L""; mbstowcs(buf, src_string.c_str(), src_len); buf[src_len] = L'\0'; basic_string<wchar_t> final_string = buf; if(buf != 0) delete [] buf; return final_string;}[Edited by - taby on March 28, 2006 11:18:55 AM]
I agree with jyk about the Boost String Algorithm library, but if you do not wish to use boost, you can do it almost as easily with the STL:
jfl.
#include <string>#include <ctype.h>#include <algorithm>int main() { std::string str = "To LoWeR cAsE"; std::transform( str.begin(), str.end(), str.begin(), tolower );}jfl.
Quote:Original post by jflanglois
I agree with jyk about the Boost String Algorithm library, but if you do not wish to use boost, you can do it almost as easily with the STL:#include <string>#include <locale>#include <algorithm>int main() { std::string str = "To LoWeR cAsE"; std::transform( str.begin(), str.end(), str.begin(), tolower );}
jfl.
Very nice. Thanks for that. :)
Quote:Very nice. Thanks for that. :)
You're welcome. As a side note, I recommend reading SGI's STL reference.
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