getline怎么用？

首先来看stl中的声明，当然要看sgi版本的了

template <class _CharT, class _Traits, class _Alloc>    basic_istream<_CharT, _Traits>& getline(istream& __is,basic_string<_CharT,_Traits,_Alloc>& __s,_CharT __delim);

template <class _CharT, class _Traits, class _Alloc>    inline basic_istream<_CharT, _Traits>& getline(basic_istream<_CharT, _Traits>& __is, basic_string<_CharT,_Traits,_Alloc>& __s){  return getline(__is, __s, '\n');}

注意最后的那个'\n'

先拿个测试用例说明下：

#include <string>#include <vector>#include <iostream>#include <algorithm>#include <iterator>using namespace std;int main(){vector<string> V;string tmp;while(getline(cin,tmp))V.push_back(tmp);sort(V.begin(),V.end());copy(V.begin(),V.end(),ostream_iterator<string>(cout,"\n"));}

getline(cin,tmp) 说明你按下回车表示一行输入完成。

但是怎么退出呐！

网上找的方法ctrl+Z

读源码看怎么回事！！

先放上源码

template <class _CharT, class _Traits, class _Alloc>    basic_istream<_CharT, _Traits>& getline(istream& __is, basic_string<_CharT,_Traits,_Alloc>& __s, _CharT __delim){size_t __nread = 0;typename basic_istream<_CharT, _Traits>::sentry __sentry(__is, true);if (__sentry) {basic_streambuf<_CharT, _Traits>* __buf = __is.rdbuf();__s.clear();int __c1;while (__nread < __s.max_size()) {int __c1 = __buf->sbumpc();if (_Traits::eq_int_type(__c1, _Traits::eof())) {__is.setstate(ios_base::eofbit);break;}else {++__nread;_CharT __c = _Traits::to_char_type(__c1);if (!_Traits::eq(__c, __delim)) __s.push_back(__c);elsebreak;              // Character is extracted but not appended.}}}if (__nread == 0 || __nread >= __s.max_size())__is.setstate(ios_base::failbit);return __is;}