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Closure in Java 7 [closed]
...lation to Java, in the hope to be useful:
//ECMAScript
var f, g;
function foo() {
var x = 0;
f = function() { return ++x; };
g = function() { return --x; };
x = 1;
print('inside foo, call to f(): ' + f()); // "2"
}
foo();
print('call to g(): ' + g()); // "1"
print('call to f(): ' + f())...
What is the difference between 'typedef' and 'using' in C++11?
...C++03) (init. statement in for loop iteration statements).
for(typedef int Foo; Foo{} != 0;) {}
// C++17 (if and switch initialization statements).
if (typedef int Foo; true) { (void)Foo{}; }
// ^^^^^^^^^^^^^^^ init-statement
switch(typedef int Foo; 0) { case 0: (void)Foo{}; }
// ^^^^^^^^^^^^...
SELECT DISTINCT on one column
...RDER BY ID) AS RowNumber
FROM MyTable
WHERE SKU LIKE 'FOO%') AS a
WHERE a.RowNumber = 1
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What techniques can be used to speed up C++ compilation times?
...ample, if you have a class,
template <typename T, typename U>
struct foo { };
and both of T and U can have 10 different options, you have increased the possible template instantiations of this class to 100. One way to resolve this is to abstract the common part of the code to a different clas...
Find when a file was deleted in Git
... Git repository in /home/mark/example/.git/
mark@lunchbox:~/example$ touch foo && git add foo && git commit -m "Added foo"
[master (root-commit) ddff7a7] Added foo
1 file changed, 0 insertions(+), 0 deletions(-)
create mode 100644 foo
mark@lunchbox:~/example$ git checkout -b newbra...
Circular (or cyclic) imports in Python
...
If you do import foo (inside bar.py) and import bar (inside foo.py), it will work fine. By the time anything actually runs, both modules will be fully loaded and will have references to each other.
The problem is when instead you do from foo ...
List changes unexpectedly after assignment. How do I clone or copy it to prevent this?
...-needing method, but sometimes unavoidable.
Example:
import copy
class Foo(object):
def __init__(self, val):
self.val = val
def __repr__(self):
return 'Foo({!r})'.format(self.val)
foo = Foo(1)
a = ['foo', foo]
b = a.copy()
c = a[:]
d = list(a)
e = copy.copy(a)
f = cop...
What does a lazy val do?
...pendent or cyclic structures. E.g. this leads to an stack overflow:
trait Foo { val foo: Foo }
case class Fee extends Foo { val foo = Faa() }
case class Faa extends Foo { val foo = Fee() }
println(Fee().foo)
//StackOverflowException
But with lazy vals it works fine
trait Foo { val foo: Foo }
ca...
How to escape braces (curly brackets) in a format string in .NET
...
For you to output foo {1, 2, 3} you have to do something like:
string t = "1, 2, 3";
string v = String.Format(" foo {{{0}}}", t);
To output a { you use {{ and to output a } you use }}.
or Now, you can also use c# string interpolation like ...
Common programming mistakes for Clojure developers to avoid [closed]
...urn literals in an anonymous function literal
This works:
user> (defn foo [key val]
{key val})
#'user/foo
user> (foo :a 1)
{:a 1}
so I believed this would also work:
(#({%1 %2}) :a 1)
but it fails with:
java.lang.IllegalArgumentException: Wrong number of args passed to: PersistentA...