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c ++中的内置函数

[英]Built-in functions in c++

原文 2012-11-18 19:00:28 7 1 c++/ function/ built-in

I was browsing through some codes at the end of the contest and found out that many people were using functions like __gcd(int,int) . 我在比赛结束时浏览了一些代码，发现很多人都在使用像__gcd(int,int)这样的函数。 What are these functions ? 这些功能是什么？ Similar functions include 类似的功能包括

__builtin_popcount(int)

__builtin_ctz(int)

__builtin_clz(int)

Where can I study about these functions ? 我在哪里可以学习这些功能？ Googling it didn't help much. 谷歌搜索没有多大帮助。

1 个解决方案

Those are all GCC specifics. 这些都是GCC的细节。 you can read about them here: http://gcc.gnu.org/onlinedocs/gcc/C-Extensions.html#C-Extensions - but be aware, they're NOT C/C++ Standards. 你可以在这里阅读它们： http ： //gcc.gnu.org/onlinedocs/gcc/C-Extensions.html#C-Extensions - 但要注意，它们不是C / C ++标准。

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有没有办法查看C ++中的内置文档？ - Is there a way to view the built-in documentation in C++?

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相关问题 C ++中的“内置”功能 - “built-in” functions in C++ 将Matlab内置函数转换为C / C ++ - convert Matlab built-in functions to C/C++ 如何在 C++ 的内置类中添加成员函数？ - How can I add member functions in built-in classes in c++? C ++中内置类型的自定义构造函数 - custom constructors for built-in types in c++ 使用内置的c ++结构 - Use built-in c++ structures C ++中的内置环形计数器 - Built-in ring-counter in c++ 什么是 <built-in> 在C ++预处理器输出？ - What is <built-in> in C++ preprocessor output? 模块化反向内置，C++ - Modular Inverse Built-In, C++ 0 C ++内置类型的初始化 - 0 initialization of C++ built-in types 有没有办法查看C ++中的内置文档？ - Is there a way to view the built-in documentation in C++?

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