学步园

 #include <iostream><br /> #include <vector><br /> #include <algorithm><br /> //#include "print.hpp"<br /> using namespace std;<br /> #include <iostream></p> <p>/* PRINT_ELEMENTS()<br /> * - prints optional C-string optcstr followed by<br /> * - all elements of the collection coll<br /> * - separated by spaces<br /> */<br /> template <class T><br /> inline void PRINT_ELEMENTS (const T& coll, const char* optcstr="")<br /> {<br /> typename T::const_iterator pos;</p> <p> std::cout << optcstr;<br /> for (pos=coll.begin(); pos!=coll.end(); ++pos) {<br /> std::cout << *pos << ' ';<br /> }<br /> std::cout << std::endl;<br /> }<br /> int main()<br /> {<br /> vector<int> coll;</p> <p> // create back inserter for coll<br /> // - inconvenient way<br /> back_insert_iterator<vector<int> > iter(coll);</p> <p> // insert elements with the usual iterator interface<br /> *iter = 1;<br /> iter++;<br /> *iter = 2;<br /> iter++;<br /> *iter = 3;<br /> PRINT_ELEMENTS(coll);</p> <p> //// create back inserter and insert elements<br /> //// - convenient way<br /> //back_inserter(coll) = 44;<br /> //back_inserter(coll) = 55;<br /> //PRINT_ELEMENTS(coll);</p> <p> //// use back inserter to append all elements again<br /> //// - reserve enough memory to avoid reallocation<br /> coll.reserve(2*coll.size());<br /> std::copy (coll.begin(), coll.end(), // source<br /> back_inserter(coll)); // destination<br /> PRINT_ELEMENTS(coll);<br /> }</p> <p>//在 The C++ Standard Library 上摘下来的一段代码。运行在2008下的时候会有问题。

追查了一下 源代码

在 xutility 下面的一段代码。

template<class _InIt, class _OutIt, class _InOutItCat><br /> inline<br /> _OutIt __CLRCALL_OR_CDECL _Copy_opt(_InIt _First, _InIt _Last, _OutIt _Dest,<br /> _InOutItCat, _Nonscalar_ptr_iterator_tag, _Range_checked_iterator_tag)<br /> { // copy [_First, _Last) to [_Dest, ...), arbitrary iterators<br /> _DEBUG_RANGE(_First, _Last);<br /> for (; _First != _Last; ++_Dest, ++_First)<br /> *_Dest = *_First;<br /> return (_Dest);<br /> }<br />

复制一个元素之后。_First就  == _Last 了，于是报错。

这个还是内部机制有问题。。。