hash_map是STL的一部分吗?-Ishash_mappartoftheSTL?

92  

The STL has hash_map, but the C++ Standard Library does not.

STL有hash_map，但是c++标准库没有。

Due to a common misconception, you may think of the C++ Standard Library as "the STL", or of parts of your toolchains implementation of the C++ Standard Library as "an STL implementation". It is not.

由于一个常见的误解，您可能认为c++标准库是“STL”，或者您的c++标准库的部分工具链实现是“STL实现”。它不是。

It is also a great shame that both MSVC++ and GCC (which implement hash_map as a compiler-specific extension), place it in the std namespace, which is highly misleading. *sigh*

MSVC++和GCC(它们将hash_map实现为一个特定于编译器的扩展)都将其放在std名称空间中，这也非常令人遗憾，这是非常容易引起误解的。*叹息*

C++11 has introduced std::unordered_map, which is not dissimilar.

c++ 11引入了std:::unordered_map，这并没有什么不同。

13  

Quoting Wikipedia (emphasis added):

引用维基百科(重点):

From the STL page:

STL的页面:

The Standard Template Library (STL) is a software library partially included in the C++ Standard Library.

标准模板库(STL)是一个部分包含在c++标准库中的软件库。

...and then from the hash_map page

…然后从hash_map页面开始

In the C++ programming language, hash_map is the name of a hashed associative container in the Standard Template Library. It is provided by several implementors, such as the GNU C++ compiler and Microsoft's Visual C++. It is not part of the C++ Standard Library, but the C++ Technical Report 1 contains the very similar container unordered_map, which will be included in the upcoming C++0x standard.

在c++编程语言中，hash_map是标准模板库中的散列关联容器的名称。它由几个实现者提供，例如GNU c++编译器和微软的Visual c++。它不是c++标准库的一部分，但是c++技术报告1包含非常类似的容器unordered_map，它将包含在即将到来的c++ 0x标准中。

So in short,

简言之,

• YES it's part of the STL.
• 是的，它是STL的一部分。
• But it IS NOT part of the standard library.
• 但它不是标准库的一部分。
• But it is supported by several very popular implementations.
• 但是有几个非常流行的实现支持它。

7  

The problem is that there is no agreed upon meaning for the term STL. Is hash_map part of Standard C++? No, it isn't. unordered_map will be part of the new C++ standard, however, and is a map implemented using hashing.

问题是，对于STL这个词没有一致的定义。hash_map是标准c++的一部分吗?不,它不是。不过，unordered_map将是新的c++标准的一部分，并且是使用散列实现的映射。

4  

Yes, hash_map is part of the STL. However, it is not part of C++03's standard library.

是的，hash_map是STL的一部分。但是，它不是c++ 03的标准库的一部分。

2  

hash_map is a part of STL, but not a part of Standard C++(C++11). And there is a similar implementation of hash_map named "std::unordered_map" in standard C++: http://www.cplusplus.com/reference/unordered_map/unordered_map/

hash_map是STL的一部分，而不是标准c++ (c++ 11)的一部分。在标准C+: http://www.cplusplusplus.com/reference/unordered_map/unordered_map/中有一个类似的hash_map的实现，名为“std:::unordered_map”

Currently, GNU C++ and MSVC++ have implemented hash_map for compiler extension, as well as Boost. Meanwhile, SGI has its own implementation for hash_map. You can refer to http://www.sgi.com/tech/stl/hash_map.html for details.

目前，GNU c++和MSVC++已经实现了用于编译器扩展的hash_map，以及Boost。同时，SGI有自己的hash_map实现。您可以参考http://www.sgi.com/tech/stl/hash_map.html获取详细信息。

-2  

No...Hash_map is not part of the STL standard.

不…Hash_map不是STL标准的一部分。