C++ string 操作

c++中对string的split,trim,find操作：

//分割字符串
void splitString(string& word, string p, vector<string>& res){
    size_t last = 0;
    size_t index = word.find_first_of(p,last);

    string str;
    while(index != string::npos){
        str = word.substr(last,index-last);
        if(str.size() > 0)
        res.push_back(str);
        last = index+1;
        index = word.find_first_of(p,last);
    }

    if(index-last > 0){
        str = word.substr(last,index-last);
        if(str.size() > 0)
            res.push_back(str);
    }
}

//去掉字符串中的空格
void trimString(string& word){
    string ss = "\n\t\r ";
    string str;
    for(size_t i=0; i<ss.size(); i++){
        str = ss.substr(i,1);
        while(true){
            size_t p = word.find(str);
            if(p != string::npos) word.erase(p,1);
            else break;
        }
        if(word == "") return;
    }
}

//计算字符串出现次数
int findString(string word, string p){
    int count = 0;
    string temp = word;
    while(true){
        size_t sp = temp.find(p);
        if(sp == string::npos) break;
        count++;
        temp = word.substr(sp+p.size());
    }

    return count;
}