大约有 15,000 项符合查询结果（耗时：0.0279秒） [XML]
How do you detect where two line segments intersect? [closed]
... For those interested, here is a simple C# implementation, taking PointF start and end coordinates for lines, that seems to be working: ideone.com/PnPJgb
– Matt
Dec 17 '12 at 0:42
...
How to install the Raspberry Pi cross compiler on my Linux host machine?
... https://stackoverflow.com/a/58559140/869402
Pre-requirements
Before you start you need to make sure the following is installed:
apt-get install git rsync cmake ia32-libs
Let's cross compile a Pie!
Start with making a folder in your home directory called raspberrypi.
Go in to this folder and ...
How to get first character of a string in SQL?
...
Why does index start with 1 and not with 0? This returns the same result: SUBSTRING (my_column, 1, 1) = SUBSTRING (my_column, 0, 2). What is it in position 0?
– FrenkyB
Aug 26 '19 at 6:46
...
What is the etymology of 'slug'? [closed]
...ven date back earlier than that, since screenplays had "slug lines" at the start of each scene, which basically sets the background for that scene (where, when, and so on). It's very similar in that it's a precis or preamble of what follows.
On a Linotype machine, a slug was a single line piece of ...
No resource found - Theme.AppCompat.Light.DarkActionBar
...
I got this after starting a fresh project in VS2019 and Building it. Simply doing a "Rebuild Solution" without having to install anything else resolved the errors.
– Glen Little
Oct 3 '19 at 17:30
...
Greenlet Vs. Threads
...or i in range(50)]
queue = list(URLS)
for t in threads:
t.start()
for t in threads:
t.join()
assert len(ip_numbers) == len(URLS)
URLS_base = ['www.google.com', 'www.example.com', 'www.python.org',
'www.yahoo.com', 'www.ubc.ca', 'www.wikipedia.org']
for...
Many-to-many relationship with the same model in rails?
...directional, no additional fields
This is the most compact in code.
I'll start out with this basic schema for your posts:
create_table "posts", :force => true do |t|
t.string "name", :null => false
end
For any many-to-many relationship, you need a join table. Here's the schema for that...
How do I recover/resynchronise after someone pushes a rebase or a reset to a published branch?
...
Starting with git 1.9/2.0 Q1 2014, you won't have to mark your previous branch origin before rebasing it on the rewritten upstream branch, as described in Aristotle Pagaltzis's answer:
See commit 07d406b and commit d96855f :
...
What are bitwise shift (bit-shift) operators and how do they work?
...ears (where justified) until I noticed abt 10 years ago that compilers had started doing this transform in the optimizer, then I stopped. Still good to know, since there are similar situations where the compiler can't make the transform for you. Or if you're working on a compiler.
...
How do I get current date/time on the Windows command line in a suitable format for usage in a file/
... this is a pretty portable):
@if (@X)==(@Y) @end /****** silent line that start JScript comment ******
@echo off
::::::::::::::::::::::::::::::::::::
::: Compile the script ::::
::::::::::::::::::::::::::::::::::::
setlocal
if exist "%~n0.exe" goto :skip_compilation
set "frm=%SystemRoot%...