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Redefining NULL
...es not require null pointers to be at the machine's address zero. HOWEVER, casting a 0 constant to a pointer value must result in a NULL pointer (§6.3.2.3/3), and evaluating the null pointer as a boolean must be false. This can be a bit awkward if you really do want a zero address, and NULL is not ...
What does T&& (double ampersand) mean in C++11?
...t[]> ptr2{ptr1};// compile error: no copy ctor.
// So we must first cast ptr1 to an rvalue
std::unique_ptr<int[]> ptr2{std::move(ptr1)};
std::unique_ptr<int[]> TakeOwnershipAndAlter(std::unique_ptr<int[]> param,\
int size)
{
for (auto i = 0; i < size; ++i) {...
Equivalent of typedef in C#
...ions:
it will not work for primitive types
the derived type can still be casted to the original type, ie we can send it to a function receiving our original type, this defeats the whole purpose
we cannot derive from sealed classes (and ie many .NET classes are sealed)
The only way to achieve a ...
A positive lambda: '+[]{}' - What sorcery is this? [duplicate]
...o pass by value instead of reference. The better way would be with static_cast<T>(lvalue) to get a prvalue of type T from an lvalue. "customary to use a generic function called val()": This isn't clear, can you show an example/link of such a val() function?
– Andrew Tom...
Subclassing a Java Builder class
...
To solve the unchecked cast warning, see the solution suggested bellow among the other answers: stackoverflow.com/a/34741836/3114959
– Stepan Vavra
Jan 12 '16 at 11:00
...
Check whether a value is a number in JavaScript or jQuery [duplicate]
...this is probably what you need.
isFinite(val)
Returns true if val, when cast to a String, is a number and it is not equal to +/- Infinity
/^\d+$/.test(val)
Returns true if val, when cast to a String, has only digits (probably not what you need).
...
Overloaded method selection based on the parameter's real type
...e. More
generally, to force the compiler to select a specific overloading, cast actual parameters to the declared types of the formal parameters.
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java: HashMap not working
...s aren't retained at runtime. They are just "syntactic sugar" for explicit casting to save you doing this:
Integer i = (Integer)myMap.get("foo");
To give you an example, this code is perfectly legal:
Map<String, Integer> myMap = new HashMap<String, Integer>();
Map<Integer, String&...
How to pass a single object[] to a params object[]
...
A simple typecast will ensure the compiler knows what you mean in this case.
Foo((object)new object[]{ (object)"1", (object)"2" }));
As an array is a subtype of object, this all works out. Bit of an odd solution though, I'll agree.
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Concatenate multiple result rows of one column into one, group by another column [duplicate]
...ase.
string_agg() expects data type text as input. Other types need to be cast explicitly (actor::text) - unless an implicit cast to text is defined - which is the case for all other character types (varchar, character, "char"), and some other types.
As isapir commented, you can add an ORDER BY c...