大约有 32,000 项符合查询结果（耗时：0.0502秒） [XML]
Get type of all variables
...king a type-error, the R program does gymnastics to transform the type and then do something surprisingly useful. The newbie programmer posts the code on his blog and says "look at this tremendous thing I did with 3 lines of R code! I have no idea how it knows what to do, but it does!"
...
Using smart pointers for class members
...o it, instead of being just passive observers. If that is indeed the case, then you need a shared ownership policy, which is what std::shared_ptr offers:
#include <memory>
class Device {
};
class Settings {
std::shared_ptr<Device> device;
public:
Settings(std::shared_ptr<De...
Java “Virtual Machine” vs. Python “Interpreter” parlance?
...e and all that.
In Java, you have to explicitly compile to bytecode and then run just the bytecode, not source code on the VM.
Even though Python uses a virtual machine under the covers, from a user's perspective, one can ignore this detail most of the time.
...
What is the difference between server side cookie and client side cookie?
...ver.
Examples of usage
You can use both sessions and cookies to store: authentication data, user preferences, the content of a chart in an e-commerce website, etc...
Pros and Cons
Below pros and cons of the solutions. These are the first that comes to my mind, there are surely others.
Cookie Pr...
What are metaclasses in Python?
...lass-to-be (if any) or the __metaclass__ global variable. The metaclass is then called with the name, bases and attributes of the class to instantiate it.
However, metaclasses actually define the type of a class, not just a factory for it, so you can do much more with them. You can, for instance, d...
How do I choose grid and block dimensions for CUDA kernels?
...ieves the maximum occupancy. The values provided by that function could be then used as the starting point of a manual optimization of the launch parameters. Below is a little example.
#include <stdio.h>
/************************/
/* TEST KERNEL FUNCTION */
/************************/
__globa...
List changes unexpectedly after assignment. How do I clone or copy it to prevent this?
...
Making another pointer does not make a copy
Using new_list = my_list then modifies new_list every time my_list changes. Why is this?
my_list is just a name that points to the actual list in memory. When you say new_list = my_list you're not making a copy, you're just adding another name that...
std::vector performance regression when enabling C++11
...if you define a function inline which is not a member function of a class, then you have indeed no choice but to mark it inline otherwise you will get multiple definition errors from the linker. If that is what you meant then OK.
– Ali
Jan 24 '14 at 19:25
...
Why does Unicorn need to be deployed together with Nginx?
...t my question is unicorn server can serve both static and dynamic process, then why we are using NGinx or Apache those can process the only static contents, combinely with the passenger or unicorn or mod_php ?
– loganathan
Jan 5 '12 at 9:20
...
Parsing JSON using Json.net
...t>();
return new Tuple<string, int, int>(type, x, y);
}
And then access the data like this: (scenario: writing to console):
var tuples = JObject.Parse(myJsonString)["objects"].Select(item => item.ToTuple()).ToList();
tuples.ForEach(t => Console.WriteLine("{0}: ({1},{2})", t.Ite...