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What is a WeakHashMap and when to use it? [duplicate]
...hen to use WeakHashMap:
... If the WeakHashMap is no good for caching, then what is it good for?
It is good to implement canonical maps. Lets say you want to associate
some extra information to an object that you have a strong reference
to. You put an entry in a WeakHashMap with the object...
Font from origin has been blocked from loading by Cross-Origin Resource Sharing policy
...ev/TT9D5-Zfnzw
Given that for fonts the browser may do a preflight check, then your S3 policy needs the cors request header as well. You can check your page in say Safari (which at present doesn't do CORS checking for fonts) and Firefox (that does) to double check this is the problem described.
S...
How do I use arrays in C++?
...<< ", " << *(x+7) << std::endl;
If x denotes an array, then array-to-pointer decay will kick in, because adding an array and an integer is meaningless (there is no plus operation on arrays), but adding a pointer and an integer makes sense:
+---+---+---+---+---+---+---+---+
x:...
lenses, fclabels, data-accessor - which library for structure access and mutation is better
... you can get it back out
get l (put l b a) = b
Second that getting and then setting doesn't change the answer
put l (get l a) a = a
And third, putting twice is the same as putting once, or rather, that the second put wins.
put l b1 (put l b2 a) = put l b1 a
Note, that the type system isn't...
How can I debug my JavaScript code? [closed]
...
+1 opera js debugger gives a better error message then all the rest
– Gabriel Solomon
Jun 15 '09 at 7:10
3
...
Javascript infamous Loop issue? [duplicate]
...
SIMPLE TO UNDERSTAND ALTERNATIVE
If you can't get your head around that then this should be easier to understand and has the same effect ...
for (var i=1; i<=5; i++) {
function clickHandler(num) {
$("#div" + i).click (
function() { alert (num) }
)
}
...
Facebook share button and custom text [closed]
...
More effective then the answer on top.
– Mateng
Sep 5 '12 at 17:32
29
...
Does Python SciPy need BLAS?
...without precompiled packages of the required libraries, you must build and then statically link to the Fortran libraries BLAS and LAPACK:
mkdir -p ~/src/
cd ~/src/
wget http://www.netlib.org/blas/blas.tgz
tar xzf blas.tgz
cd BLAS-*
## NOTE: The selected Fortran compiler must be consistent for BLAS...
How to set Java environment path in Ubuntu
...TH:$HOME/bin:$JAVA_HOME/bin
export JAVA_HOME
export JRE_HOME
export PATH
Then Log out and Log in ubuntu for setting up the paths...
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Is file append atomic in UNIX?
...t two lines get mangled?) If the append is not atomic in the above sense, then what's the best way of ensuring mutual exclusion?
...