大约有 44,480 项符合查询结果（耗时：0.0306秒） [XML]
Difference between malloc and calloc?
...
calloc() gives you a zero-initialized buffer, while malloc() leaves the memory uninitialized.
For large allocations, most calloc implementations under mainstream OSes will get known-zeroed pages from the OS (e.g. via POSIX mmap(MAP_ANONYMOUS) or Window...
Shiro vs. SpringSecurity [closed]
I have currently evaluating Java based security frameworks, I am a Spring 3.0 user so it seemed that SpringSecurity would be the right Choice, but Spring security seems to suffer from excessive complexity, it certainly does not seem like it is making security easier to implement, Shiro seems to be m...
What is the difference between String and string in C#?
...an alias in C# for System.String.
So technically, there is no difference. It's like int vs. System.Int32.
As far as guidelines, it's generally recommended to use string any time you're referring to an object.
e.g.
string place = "world";
Likewise, I think it's generally recommended to use Str...
When to catch java.lang.Error?
In what situations should one catch java.lang.Error on an application?
16 Answers
16...
Invert “if” statement to reduce nesting
...
A return in the middle of the method is not necessarily bad. It might be better to return immediately if it makes the intent of the code clearer. For example:
double getPayAmount() {
double result;
if (_isDead) result = deadAmount();
else {
if (_isSeparated) result...
String.equals versus == [duplicate]
...kens and stores them in an array of strings, and then compares a variable with the first home ... why isn't it working?
20 ...
What does !! mean in ruby?
...
Not not. It's used to convert a value to a boolean:
!!nil #=> false
!!"abc" #=> true
!!false #=> false
It's usually not necessary to use though since the only false values to Ruby are nil and false, so it's usually best ...
Beyond Stack Sampling: C++ Profilers
.../02/10. The days before Christmas are dripping away and I've pretty much hit a major road block as a windows programmer. I've been using AQTime, I've tried sleepy, shiny, and very sleepy, and as we speak, VTune is installing. I've tried to use the VS2008 profiler, and it's been positively punishi...
Hyphen, underscore, or camelCase as word delimiter in URIs?
I'm designing an HTTP-based API for an intranet app. I realize it's a pretty small concern in the grand scheme of things, but: should I use hyphens, underscores, or camelCase to delimit words in the URIs?
...
What is the reason for performing a double fork when creating a daemon?
...hon. I've found the following question , which has some good resources in it which I am currently following, but I'm curious as to why a double fork is necessary. I've scratched around google and found plenty of resources declaring that one is necessary, but not why.
...