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What is the difference between 'E', 'T', and '?' for Java generics?
... wildcard which is used when providing a type argument, e.g. List<?> foo = ... means that foo refers to a list of some type, but we don't know what.
All of this is generics, which is a pretty huge topic. You may wish to learn about it through the following resources, although there are more a...
What does 'const static' mean in C and C++?
...n other forums. My best guess is that it's used in C to hide the constant foo from other modules. Is this correct? If so, why would anyone use it in a C++ context where you can just make it private ?
...
Jasmine JavaScript Testing - toBe vs toEqual
...nd toEqual, let's imagine three objects.
var a = { bar: 'baz' },
b = { foo: a },
c = { foo: a };
Using a strict comparison (===), some things are "the same":
> b.foo.bar === c.foo.bar
true
> b.foo.bar === a.bar
true
> c.foo === b.foo
true
But some things, even though they are "e...
How can I get a list of all classes within current module in Python?
...per' way to do it, but your snippet is on the right track: just add import foo to foo.py, do inspect.getmembers(foo), and it should work fine.
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Undefined reference to static class member
...he static member somewhere (after the class definition). Try this:
class Foo { /* ... */ };
const int Foo::MEMBER;
int main() { /* ... */ }
That should get rid of the undefined reference.
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Why use the 'ref' keyword when passing an object?
...nt to change what the object is:
TestRef t = new TestRef();
t.Something = "Foo";
DoSomething(ref t);
void DoSomething(ref TestRef t)
{
t = new TestRef();
t.Something = "Not just a changed t, but a completely different TestRef object";
}
After calling DoSomething, t does not refer to the origin...
Normal arguments vs. keyword arguments
... where the distinction is important. Consider the following function:
def foo(*positional, **keywords):
print "Positional:", positional
print "Keywords:", keywords
The *positional argument will store all of the positional arguments passed to foo(), with no limit to how many you can provid...
How to retrieve a module's path?
...e, say you have two files (both of which are on your PYTHONPATH):
#/path1/foo.py
import bar
print(bar.__file__)
and
#/path2/bar.py
import os
print(os.getcwd())
print(__file__)
Running foo.py will give the output:
/path1 # "import bar" causes the line "print(os.getcwd())" to run
/path2/...
Greedy vs. Reluctant vs. Possessive Quantifiers
...n't match the f in the regex, so it backtracks one more step (leaving the "foo" at the end of the string unmatched). Now, the matcher finally matches the f in the regex, and the o and the next o are matched too. Success!
A reluctant or "non-greedy" quantifier first matches as little as possible. So...
Why does a RegExp with global flag give wrong results?
...tart from the last used index, instead of 0. Take a look:
var query = 'Foo B';
var re = new RegExp(query, 'gi');
var result = [];
result.push(re.test('Foo Bar'));
alert(re.lastIndex);
result.push(re.test('Foo Bar'));
If you don't want to manually reset lastIndex to 0 after every test, ju...