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C语言结构体里的成员数组和指针 - C/C++ - 清泛网 - 专注C/C++及内核技术
...->p的偏移之所以是0x8而不是0x6，是因为内存对齐了（我在64位系统上）。关于内存对齐，可参看《深入理解C语言》一文。
好了，现在你知道为什么原题中会访问到了0x4的地址了吧，因为是相对地址。
相对地址有很好多处，其...
How do I execute inserts and updates in an Alembic upgrade script?
...m sqlalchemy import orm
from sqlalchemy.ext.declarative import declarative_base
Base = declarative_base()
class Player(Base):
__tablename__ = 'players'
id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.String, nullable=False)
team_name = sa.Column('team', sa.String...
Count(*) vs Count(1) - SQL Server
..._GUID() in Oracle is quite computation intensive function.
In my test database, t_even is a table with 1,000,000 rows
This query:
SELECT COUNT(SYS_GUID())
FROM t_even
runs for 48 seconds, since the function needs to evaluate each SYS_GUID() returned to make sure it's not a NULL.
However, t...
How to repeat a “block” in a django template
...the same django template. I want this block to appear more than once in my base template:
14 Answers
...
System.Timers.Timer vs System.Threading.Timer
...nt sinks
at regular intervals. The class is intended for use as a server-based
or service component in a multithreaded environment; it has no user
interface and is not visible at runtime.
System.Threading.Timer,
which executes a single callback method on a thread pool thread at
regular i...
Python: Why is functools.partial necessary?
.....:
>>> import functools
>>> f = functools.partial(int, base=2)
>>> f.args
()
>>> f.func
<type 'int'>
>>> f.keywords
{'base': 2}
>>>
functools.partial's returned function is decorated with attributes useful for introspection -- the func...
Best practice for Django project working directory structure
...t, excluded from VCS. It's used to
store media/static files and sqlite database during development. Everything in
tmp could be deleted anytime without any problems.
Virtualenv
I prefer virtualenvwrapper and place all venvs into ~/.venvs directory,
but you could place it inside tmp/ to keep it togeth...
Is there a decorator to simply cache function return values?
...ion while the property syntax suggests a quick lookup.
[Update: The class-based memoization decorator I had linked to and quoted here previously doesn't work for methods. I've replaced it with a decorator function.] If you're willing to use a general-purpose memoization decorator, here's a simple...
How can I position my div at the bottom of its container?
...y).
The most common way of doing this is the "CSS sticky footer" approach demonstrated, or a slightly slimmer variation. This approach works great -- IF you have a fixed height footer.
If you need a variable height footer that will appear at the bottom of the window if the content is too short, an...
__init__ for unittest.TestCase
...
You are overriding the TestCase's __init__, so you might want to let the base class handle the arguments for you.
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