c++在线手册汇总

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http://www.cplusplus.com/

2. cppreference.com

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http://en.cppreference.com

3. c++中文手册(脚本之家)

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http://shouce.jb51.net/c++/

4. msdn APIs and reference

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https://msdn.microsoft.com/library

5. Linux man pages online

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http://www.man7.org/linux/man-pages/index.html