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Odd behavior when Java converts int to byte?
...+ unsignedByte);
Would print out: "Signed: -1 Unsigned: 255"
What's actually happening here?
We are using bitwise AND to mask all of the extraneous sign bits (the 1's to the left of the least significant 8 bits.)
When an int is converted into a byte, Java chops-off the left-most 24 bits
111111...
Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?
...
Generically, a covariant type parameter is one which is allowed to vary down as the class is subtyped (alternatively, vary with subtyping, hence the "co-" prefix). More concretely:
trait List[+A]
List[Int] is a subtype of List[A...
Differences between ExpandoObject, DynamicObject and dynamic
...c keyword to interact with a normal instance, the DLR performs late-bound calls to the instance's normal methods.
The IDynamicMetaObjectProvider interface allows a class to take control of its late-bound behavior.
When you use the dynamic keyword to interact with an IDynamicMetaObjectProvider imple...
Turning a string into a Uri in Android
...ourse if there are any spaces in the string you pass in your app will barf all over the place if you launch an Intent with this Uri.
– Christopher Perry
Aug 9 '13 at 22:08
add...
Calling class staticmethod within the class body?
... def stat_func():
return 42
_ANS = stat_func.__func__() # call the staticmethod
def method(self):
ret = Klass.stat_func()
return ret
As an aside, though I suspected that a staticmethod object had some sort of attribute storing the original function, I had no ...
What new capabilities do user-defined literals add to C++?
C++11 introduces user-defined literals which will allow the introduction of new literal syntax based on existing literals ( int , hex , string , float ) so that any type will be able to have a literal presentation.
...
vs2008编译boost详细步骤 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...t --without-python --build-type=complete link=shared threading=multi install
(2)只编译 release 版本 regex 动态库，包括头文件和库文件
bjam --toolset=msvc-9.0 --prefix=D:\05_Computer\04_3rdPatry\02Boost\boost_1_44_0\output1 --with-regex link=shared threading=multi variant=rel...
How to select an element inside “this” in jQuery?
...
does find only return the first occurance or all the occurances?
– Vignesh S
Nov 23 '16 at 17:58
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How to make a cross-module variable?
...as if a global from any other module that includes __builtin__ -- which is all of them, by default.
a.py contains
print foo
b.py contains
import __builtin__
__builtin__.foo = 1
import a
The result is that "1" is printed.
Edit: The __builtin__ module is available as the local symbol __builtin...
Why wasn't PyPy included in standard Python?
...e JIT compilation and lower memory footprint greatly improve the speeds of all Python code?
6 Answers
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