A destructor is a function without arguments that is called when a user-defined object is about to be destroyed. It is named after the type it destructs with a ~ prefix.
class C{
int* is;
string s;
public:
C()
: is( new int[10] ){
}
~C(){ // destructor definition
...
In assignments, you can split an Iterable into values using the "unpacking" syntax:
Destructuring as values
a, b = (1, 2)
print(a)
# Prints: 1
print(b)
# Prints: 2
If you try to unpack more than the length of the iterable, you'll get an error:
a, b, c = [1]
# Raises: ValueError:...
Sometimes when destructuring maps, you would like to bind the destructured values to their respective key name. Depending on the granularity of the data structure, using the standard destructuring scheme may be a little bit verbose.
Let's say, we have a map based record like so :
(def john {:lastn...
(defn print-some-items
[[a b :as xs]]
(println a)
(println b)
(println xs))
(print-some-items [2 3])
This example prints the output
2
3
[2 3]
The argument is destructured and the items 2 and 3 are assigned to the symbols a and b. The original argument, the entire vector [2 ...
The Standard (10.4) states:
Member functions can be called from a constructor (or destructor) of an abstract class; the effect of making a virtual call (10.3) to a pure virtual function directly or indirectly for the object being created (or destroyed) from such a constructor (or destructor) is u...
class base { };
class derived: public base { };
int main() {
base* p = new derived();
delete p; // The is undefined behavior!
}
In section [expr.delete] §5.3.5/3 the standard says that if delete is called on an object whose static type does not have a virtual destructor:
if the...
The behaviour of virtual functions in constructors and destructors is often confusing when first encountered.
#include <iostream>
using namespace std;
class base {
public:
base() { f("base constructor"); }
~base() { f("base destructor"); }
virtual co...
Use list() to quick assign a list of variable values into an array. See also compact()
// Assigns to $a, $b and $c the values of their respective array elements in $array with keys numbered from zero
list($a, $b, $c) = $array;
With PHP 7.1 (currently in beta) you will be able to use s...
If a class is intended to be used polymorphically, with derived instances being stored as base pointers/references, its base class' destructor should be either virtual or protected. In the former case, this will cause object destruction to check the vtable, automatically calling the correct destruc...
Function definition:
def run_training(train_X, train_Y):
Inputs variables:
X = tf.placeholder(tf.float32, [m, n])
Y = tf.placeholder(tf.float32, [m, 1])
Weight and bias representation
W = tf.Variable(tf.zeros([n, 1], dtype=np.float32), name="weight")
b = tf.Variable(tf.zeros([...
