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Why do we need C Unions?
...efined behavior should be removed. It is, in fact, defined behavior. See footnote 82 of the C99 standard: If the member used to access the contents of a union object is not the same as the member last used to store a value in the object, the appropriate part of the object representation of the val...
When to use single quotes, double quotes, and backticks in MySQL
...esults (or errors) depending on SQL mode:
SELECT "column" FROM table WHERE foo = "bar"
ANSI_QUOTES disabled
The query will select the string literal "column" where column foo is equal to string "bar"
ANSI_QUOTES enabled
The query will select the column column where column foo is equal to column bar...
汇编常用寄存器及指令基础总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...将value的地址放到 ebx中。
四、间接寻址语法
INTEL：Instr foo,segreg:[base+index*scale+disp]
AT&T：instr %segreg:disp(base,index,scale),foo
五、 后缀
AT&T 语法中大部分指令操作码的最后一个字母表示操作数大小， “b”表示 byte（一个字节...
Add an element to an array in Swift
...he way Apple implemented this is kind of irritating. Presumably, anArray+="Foo" does the same thing as anArray+=["Foo"] Personally, I'll only be using the latter syntax to avoid confusing myself.
– original_username
Jul 7 '14 at 5:56
...
How to set default values in Rails?
...e ActiveRecord Callbacks).
So, IMO it should look something like:
class Foo < ActiveRecord::Base
after_initialize :assign_defaults_on_new_Foo
...
attr_accessible :bar
...
private
def assign_defaults_on_new_Foo
# required to check an attribute for existence to weed out existing ...
What's the difference between == and .equals in Scala?
...w ArrayList() will return false, as both arguments are different instances
foo equals foo will return true, unless foo is null, then will throw a NullPointerException
foo == foo will return true, even if foo is null
foo eq foo will return true, since both arguments link to the same reference
...
What techniques can be used to speed up C++ compilation times?
...ample, if you have a class,
template <typename T, typename U>
struct foo { };
and both of T and U can have 10 different options, you have increased the possible template instantiations of this class to 100. One way to resolve this is to abstract the common part of the code to a different clas...
How can I start an interactive console for Perl?
...:
> gmtime(2**30)
gmtime(2**30) = Sat Jan 10 13:37:04 2004
> $x = 'foo'
$x = 'foo' = foo
> $x =~ s/o/a/g
$x =~ s/o/a/g = 2
> $x
$x = faa
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Stubbing a class method with Sinon.js
...le to get the stub to work on an Ember class method like this:
sinon.stub(Foo.prototype.constructor, 'find').returns([foo, foo]);
expect(Foo.find()).to.have.length(2)
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How to convert a PIL Image into a numpy array?
...to a numpy array this way:
import numpy
import PIL
img = PIL.Image.open("foo.jpg").convert("L")
imgarr = numpy.array(img)
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