大约有 19,000 项符合查询结果（耗时：0.0395秒） [XML]
How can I quickly sum all numbers in a file?
...ing as the awk solution in Ayman Hourieh's answer:
% perl -nle '$sum += $_ } END { print $sum'
If you're curious what Perl one-liners do, you can deparse them:
% perl -MO=Deparse -nle '$sum += $_ } END { print $sum'
The result is a more verbose version of the program, in a form that no one ...
Cast Int to enum in Java
...olean Compare(int i){return id == i;}
public static A GetValue(int _id)
{
A[] As = A.values();
for(int i = 0; i < As.length; i++)
{
if(As[i].Compare(_id))
return As[i];
}
return A.None;...
What is the best way to create constants in Objective-C
...s, enum is great and you absolutely should use it. (Even better, use the NS_ENUM and NS_OPTIONS macros.) For other things, you must use something else; enum does not do anything but integers.
And other questions
I was thinking about importing the file in the Reddit-Prefix.pch file to make the c...
iOS 7 parallax effect in my view controller
...omIOS7MotionEffectExtent = 10.0;
- (void)applyMotionEffects:(UIView *YOUR_VIEW) {
if (NSClassFromString(@"UIInterpolatingMotionEffect")) {
UIInterpolatingMotionEffect *horizontalEffect = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.x"
...
How to optimize for-comprehensions and loops in Scala?
...ormance in simple cases:
http://groups.google.com/group/scala-user/browse_thread/thread/86adb44d72ef4498
http://groups.google.com/group/scala-language/browse_thread/thread/94740a10205dddd2
Here is the issue in the bug tracker:
https://issues.scala-lang.org/browse/SI-4633
Update 5/28:
As a sho...
Why does C++11 not support designated initializer lists as C99? [closed]
...kery, so just sharing for fun.
#define with(T, ...)\
([&]{ T ${}; __VA_ARGS__; return $; }())
And use it like:
MyFunction(with(Params,
$.Name = "Foo Bar",
$.Age = 18
));
which expands to:
MyFunction(([&] {
Params ${};
$.Name = "Foo Bar", $.Age = 18;
return $;
}()));
...
Why is TypedReference behind the scenes? It's so fast and safe… almost magical!
...
Short answer: portability.
While __arglist, __makeref, and __refvalue are language extensions and are undocumented in the C# Language Specification, the constructs used to implement them under the hood (vararg calling convention, TypedReference type, arglist...
Python list of dictionaries search
... 3.6.4, W7x64.
from random import randint
from timeit import timeit
list_dicts = []
for _ in range(1000): # number of dicts in the list
dict_tmp = {}
for i in range(10): # number of keys for each dict
dict_tmp[f"key{i}"] = randint(0,50)
list_dicts.append( dict_tmp )
d...
Resolve Type from Class Name in a Different Assembly
...pe>
{
private static Dictionary<string, Type> _types;
private static object _lock = new object();
public static Type FromString(string typeName)
{
if (_types == null) CacheTypes();
if (_types.ContainsK...
Perl flags -pe, -pi, -p, -w, -d, -i, -t?
...ns (for most things):
$ perl -MO=Deparse -p -e 1
LINE: while (defined($_ = <ARGV>)) {
'???';
}
continue {
die "-p destination: $!\n" unless print $_;
}
-e syntax OK
1 is represented by '???', because it is optimized away.
$ perl -MO=Deparse -p -i -e 1
BEGIN { $^I = ""; }
LINE...