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Iterating each character in a string using Python
...thon 2.x, range() creates a list, so for a very long length you may end up allocating a very large block of memory. At the very least use xrange() in those cases. Also, repeated indexing of the same string is much slower than iterating directly over the string. If you need the index, use enumerate()...
Why are exclamation marks used in Ruby methods?
... convention, the names of procedures
that store values into previously
allocated locations (see section 3.4)
usually end in ``!''. Such procedures
are called mutation procedures. By
convention, the value returned by a
mutation procedure is unspecified.
...
Best way to store JSON in an HTML attribute?
...then how do I write it back in using jQuery in the same way that it was in PHP?
– BadHorsie
Sep 6 '11 at 16:01
...
Why does my application spend 24% of its life doing a null check?
... likely to already be adjacent in memory, and thus in the cache, since you allocated one after the other. With the GC heap compacting algorithm otherwise having an unpredictable affect on that. Best to not let me guess at this, measure so you know a fact.
– Hans Passant
...
手把手教你用Strace诊断问题 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...CPU 排序。
在本例中大家很容易发现 CPU 主要是被若干个 PHP 进程占用了，同时 PHP 进程占用的比较多的内存，不过系统内存尚有结余，SWAP 也不严重，这并不是问题主因。
不过在 CPU 列表中能看到 CPU 主要消耗在内核态「sy」，...
difference between variables inside and outside of __init__()
...s if you don't create them in __init__().
– too much php
Oct 8 '09 at 11:43
3
@too much php: All ...
What's the most efficient way to erase duplicates and sort a vector?
...explained in my answer, the implementation build a node (including dynamic allocation) for each element from the input sequence, which is wasteful for every value that ends up being a duplicate. There is no way the optimizer could know it could skip that.
– alexk7
...
Are Exceptions in C++ really slow
...ndle complex data structures, are
exception throwing, and
dynamic memory allocation.
Happily in C++ one can often avoid both in time-critical code.
Unfortunately There Ain’t No Such Thing As A Free Lunch, even if the default efficiency of C++ comes pretty close. :-) For the efficiency gained ...
C++ mark as deprecated
...d]] attribute (see section 7.6.5 [dcl.attr.deprecated]).
The attribute-token deprecated can be used to mark names and entities whose use is still allowed, but is discouraged for some reason.
For example, the following function foo is deprecated:
[[deprecated]]
void foo(int);
It is possible ...
Are there strongly-typed collections in Objective-C?
...natomic) T prop;
@end
Use:
FooClass<NSString *> *foo = [[FooClass alloc] init];
NSArray<FooClass<NSString *> *> *fooAry = [NSArray array];
Be careful about those *s.
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