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      2. 将映射值复制到 STL 中的向量

        Copy map values to vector in STL(将映射值复制到 STL 中的向量)

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                • 本文介绍了将映射值复制到 STL 中的向量的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!


                  目前正在通过 Effective STL 工作.第 5 条建议通常最好使用范围成员函数而不是它们的单个元素对应物.我目前希望将地图中的所有值(即 - 我不需要键)复制到向量中.

                  Working my way through Effective STL at the moment. Item 5 suggests that it's usually preferable to use range member functions to their single element counterparts. I currently wish to copy all the values in a map (i.e. - I don't need the keys) to a vector.



                  在这里你不能轻易使用范围,因为你从地图中得到的迭代器是指一个 std::pair,你将用来插入迭代器的地方into a vector 指的是存储在 vector 中的类型的对象,它(如果您丢弃密钥)不是一对.

                  You can't easily use a range here because the iterator you get from a map refers to a std::pair, where the iterators you would use to insert into a vector refers to an object of the type stored in the vector, which is (if you are discarding the key) not a pair.


                  I really don't think it gets much cleaner than the obvious:

                  #include <map>
                  #include <vector>
                  #include <string>
                  using namespace std;
                  int main() {
                      typedef map <string, int> MapType;
                      MapType m;  
                      vector <int> v;
                      // populate map somehow
                      for( MapType::iterator it = m.begin(); it != m.end(); ++it ) {
                          v.push_back( it->second );


                  which I would probably re-write as a template function if I was going to use it more than once. Something like:

                  template <typename M, typename V> 
                  void MapToVec( const  M & m, V & v ) {
                      for( typename M::const_iterator it = m.begin(); it != m.end(); ++it ) {
                          v.push_back( it->second );

                  这篇关于将映射值复制到 STL 中的向量的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!



                  What is the past-the-end iterator in STL C++?(STL C++ 中的最后迭代器是什么?)
                  vector::at vs. vector::operator[](vector::at 与 vector::operator[])
                  C++ equivalent of StringBuffer/StringBuilder?(C++ 等效于 StringBuffer/StringBuilder?)
                  Adding types to the std namespace(将类型添加到 std 命名空间)
                  Is the C++ std::set thread-safe?(C++ std::set 线程安全吗?)
                  How to use std::find/std::find_if with a vector of custom class objects?(如何将 std::find/std::find_if 与自定义类对象的向量一起使用?)

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