问题描述
如标题中提到的，我正在寻找能够给我比atoi更多性能的东西。目前，我知道的最快的方法是
As mentioned in the title, I'm looking for something that can give me more performance than atoi. Presently, the fastest way I know is
atoi(mystring.c_str())
最后，我更喜欢不依赖Boost的解决方案。是否有任何人有这样的性能技巧这样做？
Finally, I would prefer a solution that doesn't rely on Boost. Does anybody have good performance tricks for doing this?
其他信息：int不会超过20亿，它总是正的，字符串中没有小数位。 / p>
Additional Information: int will not exceed 2 billion, it is always positive, the string has no decimal places in it.
推荐答案
atoi 这在Andrei Alexandrescu在C ++和2012年之后的会议上的演讲中得到了强有力的证明。 Hi s替换使用循环展开和ALU并行性，以实现数量级的整体改进。我没有他的资料，但此链接使用类似的技术：
atoi can be improved upon significantly, given certain assumptions. This was demonstrated powerfully in a presentation by Andrei Alexandrescu at the C++ and Beyond 2012 conference. Hi s replacement used loop unrolling and ALU parallelism to achieve orders of magnitude in perf improvement. I don't have his materials, but this link uses a similar technique: http://tombarta.wordpress.com/2008/04/23/specializing-atoi/
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