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How to automatically convert strongly typed enum into int?
...That's another weird example of 'we know better what you want to do' from C++ creators. Conventional (old-style) enums had tons of benefits like implicit conversion to indexes, seamless using of bitwise operations etc.. The new style enums added a really great scoping thing, but... You cannot use j...
Android应用开发性能优化完全分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...譬如Paint的实例化操作不要写在onDraw()方法中等）；
对于并发下载等类似逻辑的实现尽量避免多次创建线程对象，而是交给线程池处理。
当然了，有了上面说明GC导致的性能后我们就该定位分析问题了，可以通过运行DDMS->Alloca...
Dependent DLL is not getting copied to the build output folder in Visual Studio
...l work except for 'copied' dependencies: project A.net references external C++ dlls as files which are 'copy always'. Project B.net references Project A. On build, B/Debug includes the C++ dlls. However, when I build Application X, which references Project B, the C++ dlls sometimes get copied (seems...
Equivalent of typedef in C#
...st<Customer>;
but that will only impact that source file. In C and C++, my experience is that typedef is usually used within .h files which are included widely - so a single typedef can be used over a whole project. That ability does not exist in C#, because there's no #include functionality...
How much is too much with C++11 auto keyword?
I've been using the new auto keyword available in the C++11 standard for complicated templated types which is what I believe it was designed for. But I'm also using it for things like:
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What is the difference between 'typedef' and 'using' in C++11?
I know that in C++11 we can now use using to write type alias, like typedef s:
7 Answers
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Why does the C preprocessor interpret the word “linux” as the constant “1”?
...hout -x as it doesn't have an extension, so gcc doesn't know if it is C or C++. You can use gcc -E -dM -x c /dev/null or gcc -E -dm -x c++ /dev/null to get the list without having to create an empty file.
– Chris Dodd
Oct 6 '13 at 19:39
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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 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...
What should go into an .h file?
...PL. #2 would be possible if export was supported and may be possible using c++0x and extern templates. IMO, header files in c++ lose much of their usefulness.
– KitsuneYMG
Dec 22 '09 at 12:39
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