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Polymorphism in C++
...ecific code selected?
Run time means the compiler must generate code for all the types the program might handle while running, and at run-time the correct code is selected (virtual dispatch)
Compile time means the choice of type-specific code is made during compilation. A consequence of this: say...
Why is Magento so slow? [closed]
Is Magento usually so terribly slow?
11 Answers
11
...
App Inventor 2开发简单计算器 - App Inventor 2 中文网 - 清泛IT论坛，有思想、有深度
...序执行过程、跟踪变量值的方法，可以帮我们找到原因。问题出在输入等号之后，此时： 前数=计算结果 后数=0 算符=“”接下来输入算符，由于算符=“”，因此执行点击算符过程的“如果...则”分支，第一行代码为【前数=后数...
Warning on “diff.renamelimit variable” when doing git push
...
Although it also could be viewed as a hard-coded bound on the amount of CPU
time we're willing to allow users to tell git to spend on handling
renames.
An upper bound may make sense, but unfortunately this upper
bound was neither communicated to the users, nor documented anywhere.
Al...
Why is f(i = -1, i = -1) undefined behavior?
...
Very nice example of how the expression could actually do something unexpected while conforming to sequencing rules. Yes, a bit contrived, but so is the code snipped I'm asking about in the first place. :)
– Nicu Stiurca
Feb 10 '14 at 8...
What is the strict aliasing rule?
...n(void)
{
// Get a 32-bit buffer from the system
uint32_t* buff = malloc(sizeof(Msg));
// Alias that buffer through message
Msg* msg = (Msg*)(buff);
// Send a bunch of messages
for (int i = 0; i < 10; ++i)
{
msg->a = i;
msg->b = i+1;...
Scheduling recurring task in Android
...leep as soon as your onReceive() method completes. If your alarm receiver called Context.startService(), it is possible that the phone will sleep before the requested service is launched. To prevent this, your BroadcastReceiver and Service will need to implement a separate wake lock policy to ensure...
What is the difference between JDK and JRE?
...ke javadoc and jdb). It is capable of creating and compiling programs.
Usually, if you only care about running Java programs on computer you will only install the JRE. It's all you need. On the other hand, if you are planning to do some Java programming, you need to install the JDK instead.
Somet...
Is System.nanoTime() completely useless?
...cific counter. Now consider the following case I use to measure time of a call:
15 Answers
...
Is there an auto increment in sqlite?
...old & italic are mine):
The AUTOINCREMENT keyword imposes extra CPU, memory, disk space, and
disk I/O overhead and should be avoided if not strictly needed. It is
usually not needed.
In SQLite, a column with type INTEGER PRIMARY KEY is an alias for the
ROWID (except in WITHOUT ROW...