copy and tolower

[bwquestion]

Hey all,

I have

char *tokens[buffer] where buffer is an int of some positive value.

The contents in the array will be some random information that has been read in from a previous getline.

What is the most efficient way to put the contents into something else and do a tolower to remove any caps.

Example:

tokens{23] contains the value "Capitol"

what it the quickest way to store "capitol" as a value I can use one time. It is ok to rewrite the variable each time as I will be looping thru the array. The tolower value does not have to be kept permanently.

Let me know if my question is not clear. Actual code is most helpful.

[bwquestion]

Is the question unclear? Is it in the wrong place?

[Moschops]

string someString(tokens[23]);
std::transform(someString.begin(), someString.end(), someString.begin(),
               (int(*)(int)) std::tolower);

[bwquestion]

Sorry for the delay getting back to this.

The code given is giving errors

std::transform and std::tolower both cause errors

Error: namespace "std" has no memeber "transform" and
Error: namespace "std" has no member "tolower"

[Peter87]

Did you include the right headers?

#include <algorithm>
#include <cctype> 

[bwquestion]

Thank you.

adding the headers corrected the issue and the conversion is working.

The item stored in the char * tokens is sucessfully converted to lower case and stored in a string.

I believe I have created another problem. The function that I have to send the info to wants a char * value like the original value. I cannot send the original value that is a char * because it could have capitol letters and the new value that is all lower case is a string.

[bwquestion]

I added strcpy to copy the string value back to the token location and all is good. Thank you both for your help.

[bluecoder]

I have a question
why do you cast ( int(*)( int )) std::tolower instead of character .

[Peter87]

There are different versions of the tolower function and the cast is needed to pick the correct one.

[bluecoder]

thanks peter87

[Duthomhas]

You should not be using a cast like that. Choose the proper tolower() function this way:

[edit] here's a link
http://www.cplusplus.com/forum/general/28440/#msg153216

[Cubbi]

Why not, Duoas? ptr_fun is deprecated (§D.8.2[depr.adaptors]), while overload resolution with cast expression is timeless (§13.4[over.over]/5)

[Duthomhas]

Ah, I didn't know that...
Alas. Direct C-casts are ugly.