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static const vs #define
...l than a post-preprocessing "if" as the code need not be compilable if not selected by the preprocessor), use #undef-ine, redefine etc.
substituted text has to be exposed:
in the translation unit it's used by, which means macros in libraries for client use must be in the header, so make and other ...
.toArray(new MyClass[0]) or .toArray(new MyClass[myList.size()])?
...t it is not created. Additionally, using the zero-length object results in casting(s) within the toArray() - method.
See the source of ArrayList.toArray():
public <T> T[] toArray(T[] a) {
if (a.length < size)
// Make a new array of a's runtime type, but my contents:
re...
How does virtual inheritance solve the “diamond” (multiple inheritance) ambiguity?
...nheritance diagrams to show the derived classes below the bases. (see "downcast", "upcast")
– peterh - Reinstate Monica
Jul 8 '16 at 20:27
...
What is an existential type?
...ely become opaque; perhaps the only thing you can still do with it is type-cast it to Object.
Summary:
===========================================================
| universally existentially
| quantified type quantified type
------------------...
Why would finding a type's initializer throw a NullReferenceException?
...found at least 3 workaround approaches for fixing the problem:
Simply by casting the Type to _Type inside the Main method:
var cctor = ((_Type)typeof(Test)).TypeInitializer;
Or making sure that approach 1 was used previously inside the method:
var warmUp = ((_Type)typeof(Test)).TypeInitializer;...
Is it safe to use -1 to set all bits to true?
...
@litb: casting -1 is certainly a nice way to get maximal unsigned values, but it's not really descriptive; that's the reason why the _MAX constants exist (SIZE_MAX was added in C99); granted, the C++ version numeric_limits<size_t...
JavaScript plus sign in front of function expression
...
Subsidiary to @TJCrowder's answer, + is usually used to force numerical casting of a value as this SO answer explains. In this instance it is called the 'unary plus operator' (for ease of googling).
var num = +variant;
So in front of a function it can be a way to force the function's result to...
Why does int i = 1024 * 1024 * 1024 * 1024 compile without error?
...
Right. Assigning an int to a long includes an implicit cast. But the value can never exist as the int in the first place to get casted :)
– Cruncher
Jul 11 '14 at 18:14
...
vs in Generics
...of the generic class, interface or method. The implication is that you can cast the type/interface/method to an equivalent with a super-type of T.
E.g. ICovariant<out Dog> can be cast to ICovariant<Animal>.
share...
Convert a float64 to an int in Go
...
Such casts have a problem in Go that can be unexpected (at least if you come from Java): "In all non-constant conversions involving floating-point or complex values, if the result type cannot represent the value the conversion suc...