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如何摆脱g ++ hash_map弃用警告?

要摆脱g++ hash_map弃用警告,您可以采用以下方法:

  1. 使用C++11标准库中的unordered_map替代hash_mapunordered_map是C++11中引入的一个哈希表容器,它提供了与hash_map类似的功能,但在C++11中已被推荐使用。
  2. 如果您的代码依赖于hash_map,但仍需要使用C++98标准,则可以考虑使用Boost库中的boost::unordered_map。Boost库提供了一组C++标准库的扩展,其中包括一个哈希表容器boost::unordered_map,它与hash_map类似,但在C++98中也可以使用。
  3. 如果您的代码依赖于hash_map,但仍需要使用C++11或更高版本的标准库,则可以考虑使用std::unordered_map,并在代码中显式指定std命名空间。例如:
代码语言:cpp
复制
#include <unordered_map>

std::unordered_map<int, std::string> my_map;
  1. 如果您的代码依赖于hash_map,但仍需要使用C++98标准库,则可以考虑使用STLPort库中的hash_map。STLPort是一个C++标准库的扩展,提供了一些C++98标准库中没有的功能,包括hash_map

总之,您可以根据您的代码需求和使用的C++标准库版本选择合适的方法来摆脱g++ hash_map弃用警告。

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C++ map 和 hashmap 区别

1. stl map is an associative array where keys are stored in sorted order using balanced trees. while hash_map is a hashed associated container, where keys are not stored in an ordered way. key, value pair is stored using a hashed function.        2. insertion and lookup takes ologn time in map, also performance would degrade as the key size increases. mainly balance operations on large key ranges would kill performance. while lookup is very efficient o(1) in hash_map.        3. map is useful where you want to store keys in sorted order, hash_map is used where keys order is not important and lookup is very efficient.        4. one more difference is map has the important property that inserting a new element into a map does not invalidate iterators that point to existing elements. erasing an element from a map also does not invalidate any iterators. performance would mostly be o(lgn) due to the implementation of a balanced tree. for map custom objects you would need at the minimum the following operators to store data in a map "<" ">" "==" and of course the other stuff for deep copy.

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