c – STL堆栈和priority_queue的插入器

std :: vector,std :: list和std :: deque有std :: back_inserter,而std :: set有std :: inserter.

对于std :: stack和std :: priority_queue,我认为等效的插入器将是一个push(),但我似乎无法找到正确的函数来调用.

我的意图是能够使用以下函数和正确的插入迭代器：

#include <string>
#include <queue>
#include <iterator>

template<typename outiter>
void foo(outiter oitr)
{
   static const std::string s1 ("abcdefghji");
   static const std::string s2 ("1234567890");
   *oitr++ = s1;
   *oitr++ = s2;
}

int main()
{
   std::priority_queue<std::string> spq;
   std::stack<std::string> stk;

   foo(std::inserter(spq));
   foo(std::inserter(stk));

   return 0;
}

解决方法:

您可以随时按自己的方式自行实现迭代器.我还没有验证这段代码,但它应该可行.强调“我还没有验证”.

template <class Container>
  class push_insert_iterator:
    public iterator<output_iterator_tag,void,void,void,void>
{
protected:
  Container* container;

public:
  typedef Container container_type;
  explicit push_insert_iterator(Container& x) : container(&x) {}
  push_insert_iterator<Container>& operator= (typename Container::const_reference value){
    container->push(value); return *this; }
  push_insert_iterator<Container>& operator* (){ return *this; }
  push_insert_iterator<Container>& operator++ (){ return *this; }
  push_insert_iterator<Container> operator++ (int){ return *this; }
};

我还要添加以下函数来帮助它使用它：

template<typename Container>
push_insert_iterator<Container> push_inserter(Container container){
    return push_insert_iterator<Container>(container);
}

标签：c,containers,stl,priority-queue,inserter
来源： https://codeday.me/bug/20191001/1838518.html