使用STL的字數

Question

如何使用STL算法計算從指定位置開始的段落中的字數？

Answer 1

#include <algorithm> 
#include <cctype>  
#include <functional> 
#include <string> 


inline unsigned CountWords(const std::string& s)   
{  
std::string x = s; 
std::replace_if(x.begin(), x.end(), std::ptr_fun <int, int> (std::isspace), ' '); 
x.erase(0, x.find_first_not_of(" ")); 
if (x.empty()) return 0; 
return std::count(x.begin(), std::unique(x.begin(), x.end()), ' ') + !std::isspace(   *s.regin());   
} 

Answer 2

int count_words(const char *input_buf) { 
    stringstream ss; 
    ss << input_buf; 
    string word; 
    int words = 0; 
    while(ss >> word) words++; 
    return words; 
}