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C++ equivalent of java's instanceof
...seClass>(ptr)) { ... }
However, this purely operates on the types as known by the compiler.
Edit:
This code should work for polymorphic pointers:
template<typename Base, typename T>
inline bool instanceof(const T *ptr) {
return dynamic_cast<const Base*>(ptr) != nullptr;
}
E...
How to get current timestamp in string format in Java? “yyyy.MM.dd.HH.mm.ss”
...me old date-time classes such as java.util.Date and java.sql.Timestamp are now legacy, supplanted by the java.time classes built into Java 8 and later. See Tutorial by Oracle.
– Basil Bourque
Dec 24 '18 at 20:01
...
Interface or an Abstract Class: which one to use?
...{
public function eat() {
// peeling
// chew
}
}
Now I give you an apple and you eat it.
What does it taste like? It tastes like an apple.
<?php
$apple = new Apple();
$apple->eat();
// Now I give you a fruit.
$fruit = new Fruit();
$fruit->eat();
What does that...
Is Dvorak typing appropriate for programming? [closed]
... Dvorak already has the huge con that the rest of the world uses qwerty, now if we start using modifications of dvorak too.. It's even worse! :)
– Thomas Bonini
Dec 18 '09 at 20:49
...
Python nonlocal statement
...: 2
# outer: 1
# global: 0
To this, using nonlocal, where inner()'s x is now also outer()'s x:
x = 0
def outer():
x = 1
def inner():
nonlocal x
x = 2
print("inner:", x)
inner()
print("outer:", x)
outer()
print("global:", x)
# inner: 2
# outer: 2
# global...
javascript: recursive anonymous function?
...
(function foo() { foo(); })();
is a stack-blowing recursive function. Now, that said, you probably don't may not want to do this in general because there are some weird problems with various implementations of Javascript. (note — that's a fairly old comment; some/many/all of the problems desc...
JavaScript function order: why does it matter?
...
var foo = 42;
//the interpreter turns it into this:
var foo;
foo = 42;
Now, how function declarations are handled:
var foo = 42;
function bar() {}
//turns into
var foo; //Insanity! It's now at the top
function bar() {}
foo = 42;
The var statements "throws" the creation of foo to the very top...
How to change past commit to include a missed file?
... add a file to the change set. After other commits, I realized the file is now missing from a HEAD^4 commit.
4 Answers
...
What is the reason behind cbegin/cend?
...ref = vec;
std::for_each(vec_ref.begin(), vec_ref.end(), SomeFunctor());
Now, we introduce cbegin/cend:
std::for_each(vec.cbegin(), vec.cend(), SomeFunctor());
Now, we have syntactic assurances that SomeFunctor cannot modify the elements of the vector (without a const-cast, of course). We expli...
unable to copy/paste in mingw shell
...ight click the icon on the top left hand corner of MINGW64:
Select Options
Now Select keys
On the right hand you will find Shortcuts
If not thicked, thick Copy and Paste
Now always remeber the instruction given to copy & paste as follows:
Copy: Ctrl+ Ins (insert)
i.e. To copy on MINGW, only h...