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What does |= (single pipe equal) and &=(single ampersand equal) mean
...se-NOT)
& means "the result is all the attributes which occur on both sides of the operand"
So it's basically acting as a mask - only retain those attributes which appear in ("everything except System"). In general:
|= will only ever add bits to the target
&= will only ever remove bits f...
UITableView set to static cells. Is it possible to hide some of the cells programmatically?
...ttps://github.com/xelvenone/StaticDataTableViewController
which can show/hide/reload any static cell(s) with or without animation!
[self cell:self.outletToMyStaticCell1 setHidden:hide];
[self cell:self.outletToMyStaticCell2 setHidden:hide];
[self reloadDataAnimated:YES];
Note to always use onl...
Convert numpy array to tuple
... Nice generalization. As a python newbie, though, I wonder if it's considered good style to use exceptions for a condition that is almost as common as the non-exceptional state. At least in c++, flow control by exceptions is usually frowned upon. Would it be better to test if type(a)==numpy.nd...
How to create a loop in bash that is waiting for a webserver to respond?
...obal. If another connection is made to that server, your results are invalid.
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What's the difference between the build and create methods in FactoryGirl?
...es not persist to the db and does not call save!, so your Active Record validations will not run. This is much faster, but validations might be important.
Using FactoryGirl.create(:factory_name) will persist to the db and will call Active Record validations. This is obviously slower but can catch v...
Is it possible to disable floating headers in UITableView with UITableViewStylePlain?
...rs from floating. If you'd like to see this added as a public API, please file a bug report: bugreport.apple.com
– jemmons
Jul 19 '10 at 0:18
5
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How long is the SHA256 hash?
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is char(64) a valid mysql statement?
– Tony Stark
Feb 10 '10 at 23:07
29
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while (1) Vs. for (;;) Is there a speed difference?
...f("foo\n");
}
void t_for() {
for(;;)
printf("foo\n");
}
.file "test.c"
.section .rodata
.LC0:
.string "foo"
.text
.globl t_while
.type t_while, @function
t_while:
.LFB2:
pushq %rbp
.LCFI0:
movq %rsp, %rbp
.LCFI1:
.L2:
movl $.LC0, %edi
...
initializing a boolean array in java
...
Correct. I did not see that. Arrays.fill should do the trick.
– Jørgen Fogh
Mar 2 '10 at 17:15
add a comment
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NSLog/printf specifier for NSInteger?
...ight use static inline NSIntToLong(NSInteger i) {return (long)i;}. This avoids disabling type checking completely (i.e. if the type of i changes).
– Steven Fisher
Dec 10 '10 at 7:22
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