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Why does casting int to invalid enum value NOT throw exception?
...een a different solution; I would rather have had the ability to make "bit array" integer types and "a set of distinct value" types as two different language features rather than conflating them both into "enum". But that's what the original language and framework designers came up with; as a result...
How is “=default” different from “{}” for default constructor and destructor?
...structor
is non-trivial, that constructor is called.
— if T is an array type,
then each element is value-initialized; — otherwise, the object is
zero-initialized.
For example:
#include <iostream>
class A {
public:
A(){}
int i;
int j;
};
class B {
public:...
What is the difference between shallow copy, deepcopy and normal assignment operation?
...that contains other lists (you could also describe it as a two-dimensional array).
If you run a "shallow copy" on e, copying it to e1, you will find that the id of the list changes, but each copy of the list contains references to the same three lists -- the lists with integers inside. That means ...
C++11 rvalues and move semantics confusion (return statement)
...ed in the copy constructor and data is allocated, but the bulk of the data array is only copied by copying the pointer (essentially). The copy elision avoids 100% of all copies.
– Mark Lakata
Dec 11 '14 at 1:26
...
What's the role of GetHashCode in the IEqualityComparer in .NET?
...oor choice for iterating over though. Internally, a dictionary contains an array of buckets, where values can be stored. When you add a Key and Value to a dictionary, the GetHashCode method is called on the Key. The hashcode returned is used to determine the index of the bucket in which the Key/Valu...
Understanding checked vs unchecked exceptions in Java
...a null reference; and indexing exceptions, such as attempting to access an array element through an index that is too large or too small.
There's also an important bit of information in the Java Language Specification:
The checked exception classes named in the throws clause are part of the contra...
Is there a difference between copy initialization and direct initialization?
...() and T[] == T* . That is, function types are function pointer types, and array types are pointer-to-element types. This sucks. It can be worked-around by A c3((A())); (parens around the expression).
– Johannes Schaub - litb
Jul 9 '09 at 1:53
...
What does O(log n) mean exactly?
...binary search. Another example is quick sort where each time we divide the array into two parts and each time it takes O(N) time to find a pivot element. Hence it N O(log N)
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When to use symbols instead of strings in Ruby?
...all_symbols:
symbols_count = Symbol.all_symbols.count # all_symbols is an array with all
# instantiated symbols.
a = :one
puts a.object_id
# prints 167778
a = :two
puts a.object_id
# prints 167858
a = :one
puts a.object_id
# prints 167778 again - the sa...
Why can templates only be implemented in the header file?
... an approach would face because "type modifier" features like pointers and arrays allow even just the built-in types to give rise to an infinite number of types, what happens when I now extend my program by adding:
baz.cpp
declares and implements class BazPrivate, and uses MyClass<BazPrivate&g...