std::string 去首尾空格

 

大家有好的方法也可以贴出来

 

 

 

// 字符串去前后空格
void trim_left_right(std::string &str)
{
 string str_temp = str;

 string::iterator new_end = remove_if(str_temp.begin(), str_temp.end(), bind2nd(equal_to (), ' '));
 str_temp.erase(new_end, str_temp.end());

 new_end = remove_if(str_temp.begin(), str_temp.end(), bind2nd(equal_to (), '\t'));
 str_temp.erase(new_end, str_temp.end());

 str = str_temp;
}

 

下面有个牛人写的  更好：

/**
 * Trim any leading and trailing white space characters from the string.
 * Note that escape sequences and quotes are not handled.
 *
 * @param inStr - string to trim.
 * @return - string without leading or trailing white space

 */

#define STR_WHITESPACE " \t\n\r\v\f"

string trimWhiteSpace(const string &inStr)
{
    string outStr;


    if (!inStr.empty())
    {
        string::size_type start = inStr.find_first_not_of(STR_WHITESPACE);


        // If there is only white space we return an empty string
        if (start != string::npos)
        {
            string::size_type end = inStr.find_last_not_of(STR_WHITESPACE);
            outStr = inStr.substr(start, end - start + 1);
        }
    }


    return outStr;

}

eg:

    FILE *srcFile = fopen("yan","r");
    if ( srcFile == NULL )
    {
         return -1;
    }
    char buf[128];
    for (;fgets(buf,128,srcFile) != NULL;memset(buf,'\0',128))
    {        
        string tmp_str = trimWhiteSpace(string(buf));
        if (tmp_str.size() > 0)
           shield_prefixs.push_back(tmp_str);
    }
    return 0;

http://blog.csdn.net/yanook/article/details/7217753