如何#include哈希与ext，tr1或__gnu_cxx在XCode，C + +

问题描述

我尝试使用 google-sparsehash库 a>并且我想包括链接中描述的散列库，

I'm trying to work with the google-sparsehash library and I'd like to include the hash library described in the link,

using ext::hash;  // or __gnu_cxx::hash, or maybe tr1::hash, depending on your OS

've tried one of each：

and I've tried one of each:

#include <ext/hash>
#include <ext>
#include <__gnu_cxx>
#include <tr1>

无法与XCode配合使用。我也有使用，在那里我被告知，__gnu_cxx不包含哈希。如何描述这个库到XCode（3.2.6）在OS X（10.6.8）？

which none worked with XCode. I've also "using", where I was told that __gnu_cxx does not contain "hash". How do I describe this library to XCode (3.2.6) on OS X (10.6.8)?

或者更一般地说，在Mac / XCode中描述的这个散列函数在哪里？

Or more generally, where is this hash function described in a Mac / XCode?

推荐答案

在C ++ 11中：

#include <functional>
using std::hash;

在带有TR1的C ++ 03中：

In C++03 with TR1:

#include <tr1/functional>
using std::tr1::hash;

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