大约有 40,000 项符合查询结果（耗时：0.0424秒） [XML]
Is there a point to minifying PHP?
...r than what regular PHP allows. The key here is static typing. On a modern CPU, a dynamic language eats branch misprediction penalty left and right. Fact that PHP arrays are hash tables also imposes high cost: lot of branch mispredictions, inefficient use of cache, poor memory prefetching, and no SI...
What Computer Science concepts should I know? [closed]
...
Systems programming
Understands the entire programming stack, hardware (CPU + Memory + Cache + Interrupts + microcode), binary code, assembly, static and dynamic linking, compilation, interpretation, JIT compilation, garbage collection, heap, stack, memory addressing…
Source Code Version Contr...
What is the memory consumption of an object in Java?
...estion to answer:
A JVM is free to store data any way it pleases internally, big or little endian, with any amount of padding or overhead, though primitives must behave as if they had the official sizes.
For example, the JVM or native compiler might decide to store a boolean[] in 64-bit long c...
How can bcrypt have built-in salts?
...$2a$10$vI8aWBnW3fID.ZQ4/zo1G.q1lRps.9cGLcZEiGDMVr5yUP1KUOYTa
This is actually three fields, delimited by "$":
2a identifies the bcrypt algorithm version that was used.
10 is the cost factor; 210 iterations of the key derivation function are used (which is not enough, by the way. I'd recommend a ...
Undefined, unspecified and implementation-defined behavior
... coming from other languages (other languages try to hide it better). Basically, it is possible to write C++ programs that do not behave in a predictable way, even though many C++ compilers will not report any errors in the program!
Let's look at a classic example:
#include <iostream>
int ma...
GOTO still considered harmful? [closed]
...are generalizations; while it is always possible to plead exception, it usually (in my experience and humble opinion) isn't worth the risks.
Unconstrained use of memory addresses (either GOTO or raw pointers) provides too many opportunities to make easily avoidable mistakes.
The more ways there ar...
Fastest hash for non-cryptographic uses?
I'm essentially preparing phrases to be put into the database, they may be malformed so I want to store a short hash of them instead (I will be simply comparing if they exist or not, so hash is ideal).
...
Why does Google prepend while(1); to their JSON responses?
...
It prevents JSON hijacking, a major JSON security issue that is formally fixed in all major browsers since 2011 with ECMAScript 5.
Contrived example: say Google has a URL like mail.google.com/json?action=inbox which returns the first 50 messages of your inbox in JSON format. Evil websites on...
Why is lock(this) {…} bad?
...
It is bad form to use this in lock statements because it is generally out of your control who else might be locking on that object.
In order to properly plan parallel operations, special care should be taken to consider possible deadlock situations, and having an unknown number of lock en...
【软著】软件著作权证书申请流程及注意事项，模板分享 - App Inventor 2 中...
...明专利来说，简单很多。只要你提供的材料及文档格式没问题，那就大概率能过。必须按照模板来写，参考模板见附件（源码模板带行号，自动就是每页50行），再配合下文的注意事项。
4、是否收费？一般来说，找第三方的...