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What is the best way to concatenate two vectors?
... for low iteration count. This assumes a good vector implementation, plus CPU instruction pipeline & [good] branch prediction, but those are pretty reliable assumptions for a modern toolchain and desktop machine. Don't know about smartphones though..
– boycy
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How to use QueryPerformanceCounter?
... should prevent my thread from getting rescheduled to anything but the 1st CPU core. (Which is obviously only a solution for a testing environment)
– Lucas
May 22 '13 at 11:04
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ListCtrl 重绘（Custom Draw） - C/C++ - 清泛网 - 专注C/C++及内核技术
... DLL的版本必须至少是4.71。但随着IE4 的发布，这已经不是问题了。(IE会夹带着这个DLL一起发布)
Custom Draw 基础
我将会尽我所能把Custom Draw的处理描述清楚，而不是简单的引用MSDN的文档。这些例子都需要你的程序有一个ListCtrl在...
Advantages to Using Private Static Methods
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Passing an extra parameter means the CPU has to do extra work to place that parameter in a register, and push it onto the stack if the instance method calls out to another method.
– Kent Boogaart
Sep 25 '08 at 18:33
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Macro vs Function in C
...hurt performance due to code bloat, which reduces the effectiveness of the CPU instruction cache. We can make fast generic data structures in C without using these techniques.
– Sam Watkins
Jun 26 '15 at 3:24
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Alarm Manager Example
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This is working code. It wakes CPU every 10 minutes until the phone turns off.
Add to Manifest.xml:
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<uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>
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<receiver android:process=":remote" android:name="....
How to handle :java.util.concurrent.TimeoutException: android.os.BinderProxy.finalize() timed out af
...ing most User Land processes for a while, and turning Screen off, reducing CPU cycles, etc. The way this is done - is on a Linux system level where the processes are Paused mid run. This can happen at any time during normal Application execution, but it will stop at a Native system call, as the cont...
What integer hash function are good that accepts an integer hash key?
... input results in a different output). The algorithm is fast except if the CPU doesn't have a built-in integer multiplication unit. C code, assuming int is 32 bit (for Java, replace >> with >>> and remove unsigned):
unsigned int hash(unsigned int x) {
x = ((x >> 16) ^ x) * ...
In-Place Radix Sort
...aiive representation. Addressing becomes more complex, but the ALU of your CPU has lots of time to spend during all the cache-misses anyway.
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How do I detect unsigned integer multiply overflow?
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Some compilers provide access to the integer overflow flag in the CPU which you could then test but this isn't standard.
You could also test for the possibility of overflow before you perform the multiplication:
if ( b > ULONG_MAX / a ) // a * b would overflow
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