大约有 40,000 项符合查询结果（耗时：0.0955秒） [XML]
What exactly is a C pointer if not a memory address?
...their addresses in pointers to them. Instead you can number your variables from 1 to whatever and store that number in the pointer. That is perfectly legal per the language standard so long as the implementation knows how to transform those numbers into addresses and how to do pointer arithmetic wit...
Get number of digits with JavaScript
... of integers (including negatives) there is a brilliant optimised solution from @Mwr247, but be careful with using Math.log10, as it is not supported by many legacy browsers. So replacing Math.log10(x) with Math.log(x) * Math.LOG10E will solve the compatibility problem.
Creating fast mathematical s...
insert a NOT NULL column to an existing table
...able standard, but invent their own just to have their own invented. Apart from that, helpful answer.
– Neonit
Sep 21 '16 at 8:56
2
...
How do you skip a unit test in Django?
...Python's unittest module has a few decorators:
There is plain old @skip:
from unittest import skip
@skip("Don't want to test")
def test_something():
...
If you can't use @skip for some reason, @skipIf should work. Just trick it to always skip with the argument True:
@skipIf(True, "I don't...
Length of a JavaScript object
... @stonyau IE8, IE9, IE10 are dead browsers that don't get support from Microsoft. IE8, IE9, IE10 user gets notification from Microsoft, that they use old, unsupported browser and should expect that stuff will not work for them. support.microsoft.com/en-us/kb/3123303
– ...
How to find all positions of the maximum value in a list?
...timated probability of occurrence of each condition and inferences allowed from predecessors. It was a little tricky figuring out the proper initialization values for max_val and max_indices which worked for all possible cases, especially if the max happened to be the first value in the list — but...
How can a Java variable be different from itself?
...m.out.println("Not ok");
}
Not ok
You can do the same with Double.NaN.
From JLS §15.21.1. Numerical Equality Operators == and !=:
Floating-point equality testing is performed in accordance with the rules of the IEEE 754 standard:
If either operand is NaN, then the result of == is false but th...
C# Object Pooling Pattern implementation
... }
isDisposed = true;
if (typeof(IDisposable).IsAssignableFrom(typeof(T)))
{
lock (itemStore)
{
while (itemStore.Count > 0)
{
IDisposable disposable = (IDisposable)itemStore.Fetch();
...
Python class inherits object
Is there any reason for a class declaration to inherit from object ?
6 Answers
6
...
Return first match of Ruby regex
...ou could try variableName[/regular expression/]. This is an example output from irb:
irb(main):003:0> names = "erik kalle johan anders erik kalle johan anders"
=> "erik kalle johan anders erik kalle johan anders"
irb(main):004:0> names[/kalle/]
=> "kalle"
...