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How do the likely/unlikely macros in the Linux kernel work and what is their benefit?
...dd $0x8,%rsp
34: c3 retq
The instruction order in memory was unchanged: first the printf and then puts and the retq return.
With __builtin_expect
Now replace if (i) with:
if (__builtin_expect(i, 0))
and we get:
0000000000000000 <main>:
0: 48 83 ...
get and set in TypeScript
... myFoo.bar = false; // calls the setter and passes false
}
However, in order to use it at all, you must make sure the TypeScript compiler targets ECMAScript5. If you are running the command line compiler, use --target flag like this;
tsc --target ES5
If you are using Visual Studio, you must ...
“Code too large” compilation error in Java
...rogram's source code without modifying its external functional behavior in order to improve some of the nonfunctional attributes of the software." How are other answers different from this?
– Padmarag
Mar 10 '10 at 5:34
...
Print multiple arguments in Python
...(name, score))
Use new-style string formatting with numbers (useful for reordering or printing the same one multiple times):
print("Total score for {0} is {1}".format(name, score))
Use new-style string formatting with explicit names:
print("Total score for {n} is {s}".format(n=name, s=score))
C...
Importing from builtin library when module with same name exists
...t relies on python treating paths in one way or looking up modules in that order may break sooner or later.
– Boaz Yaniv
May 17 '11 at 14:38
1
...
What are bitwise shift (bit-shift) operators and how do they work?
...substitute shifts for multiplications when possible. What? Bitshifts are orders of magnitude faster when it comes down to the low level operations of a CPU, a good optimizing compiler would do the exact opposite, that is, turning ordinary multiplications by powers of two into bit shifts.
...
Makefile, header dependencies
...n the object files, when it should obviously be on the sources and had the order of dependency wrong for the two targets, too. That's what I get for typing from memory. Try it now.
– dmckee --- ex-moderator kitten
Aug 23 '11 at 21:15
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Switch case with fallthrough?
I am looking for the correct syntax of the switch statement with fallthrough cases in Bash (ideally case-insensitive).
In PHP I would program it like:
...
AngularJS - How to use $routeParams in generating the templateUrl?
... // or other onload stuff
}
// initialize
$scope.templateUrl = 'ci_index.php/adminctrl/enquiry/'+$routeParams.page;
...
I believe it is a weakness in angularjs that $routeParams is NOT visible inside the router. A tiny enhancement would make a world of difference during implementation.
...
Is there any difference between the `:key => “value”` and `key: “value”` hash notations?
... 'pancakes house?' }
The JavaScript style (key: value) is only useful if all of your Hash keys are "simple" symbols (more or less something that matches /\A[a-z_]\w*\z/i, AFAIK the parser uses its label pattern for these keys).
The :$in style symbols show up a fair bit when using MongoDB so you'l...