大约有 4,600 项符合查询结果(耗时:0.0260秒) [XML]

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Is std::vector so much slower than plain arrays?

...ector. So much for the compiler being smart enough to optimize out all the C++ness and make STL containers as fast as raw arrays. The bottom line is that the compiler is unable to optimize away the no-op default constructor calls when using std::vector. If you use plain new[] it optimizes them away...
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What differences, if any, between C++03 and C++11 can be detected at run-time?

...h, when compiled with a C compiler will return 0, and when compiled with a C++ compiler, will return 1 (the trivial sulution with #ifdef __cplusplus is not interesting). ...
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Is local static variable initialization thread-safe in C++11? [duplicate]

...n gcc: Do not emit the extra code to use the routines specified in the C++ ABI for thread-safe initialization of local statics. You can use this option to reduce code size slightly in code that doesn't need to be thread-safe. Also, have a look at the old thread Are function static variables t...
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How to use stringstream to separate comma separated strings [duplicate]

... ah, so it sounds like the problem caused by c++ ability to have a method outside of a class. And probably this is why it never lead to problem in C# / Java. But is it a good practice to have a method outside of a class? Modern languages like Kotlin don't even allow sta...
https://www.tsingfun.com/ilife/idea/736.html 

6个变态的C语言Hello World程序 - 创意 - 清泛网 - 专注C/C++及内核技术

...所有程序都可以在GCC下编译通过,只有最后一个需要动用C++...下面的六个程序片段主要完成这些事情: 1、输出Hello, World 2、混乱C语言的源代码 下面的所有程序都可以在GCC下编译通过,只有最后一个需要动用C++的编译器g++...
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2014年腾讯代码报告—累计代码行14亿 - 创意 - 清泛网 - 专注C/C++及内核技术

...码新增量就提升一倍,仅去年1年就新增了4.7亿行。其中C++语言稳坐冠军宝座,接近1.5亿行,而Object-C凭借iOS应用的强势而日益强盛。 另外,根据图表,腾讯的程序猿男女比例为9:1,男生每月3400行,女生每月2300行。就毕业院校...
https://www.tsingfun.com/it/cpp/1484.html 

error C2275: “size_t”: 将此类型用作表达式非法 - C/C++ - 清泛网 - 专注C/C++及内核技术

...C的编译器要求将变量的申明放在一个函数块的头部,而c++没有这样的要求造成的。解决的办法就是把变量的声明全部放在变量的生...这个错误是由于C的编译器要求将变量的申明放在一个函数块的头部,而c++没有这样的要求造成...
https://www.tsingfun.com/it/cpp/2034.html 

Linux编程中各种头文件 - C/C++ - 清泛网 - 专注C/C++及内核技术

Linux编程中各种头文件2.stdlib.h stdlib 头文件里包含了C、C++语言的最常用的系统函数stdlib.h里面定义了五种类型、一些宏和通用工具函数。类型例如size_t、wc...1.stdlib.h  stdlib 头文件里包含了C、C++语言的最常用的系统函数 stdlib.h...
https://www.tsingfun.com/it/cpp/2453.html 

程序崩溃时malloc/new可能导致死锁,程序卡死退不出 - C/C++ - 清泛网 - 专...

...oc/new可能导致死锁,程序卡死退不出Windows Server2016服务器C++崩溃时容易不彻底,导致卡住死锁,Server2008死锁概率低一些,死锁感觉是由于malloc不可重入导致的。操作系统底层API行为可能不一致,可能有办法指定 1、程序崩溃时m...
https://www.tsingfun.com/it/tech/1692.html 

iOS开发如何提高 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...能称得上熟悉iOS开发的。某些在校的学生,仅仅做了几个C++的大作业,就在求职简历里面写上“精通C++”,则真是让人哭笑不得。 在多写代码的同时,我们也要注意不要”重复造轮子”,尽量保证每次写的代码都能具有复用性...