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How to get current timestamp in milliseconds since 1970 just the way Java gets
...hrono>
// ...
using namespace std::chrono;
milliseconds ms = duration_cast< milliseconds >(
system_clock::now().time_since_epoch()
);
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SQL statement to select all rows from previous day
...
In SQL Server do like this:
where cast(columnName as date) = cast(getdate() -1 as date)
You should cast both sides of the expression to date to avoid issues with time formatting.
If you need to control interval in more detail, then you should try something...
C# Interfaces. Implicit implementation versus Explicit implementation
...tation allows you to access the interface through the class you created by casting the interface as that class and as the interface itself. Explicit implementation allows you to access the interface only by casting it as the interface itself.
MyClass myClass = new MyClass(); // Declared as concrete...
What exactly is nullptr?
...er version. Passing NULL or 0 would confusingly select the int version.
A cast of nullptr_t to an integral type needs a reinterpret_cast, and has the same semantics as a cast of (void*)0 to an integral type (mapping implementation defined). A reinterpret_cast cannot convert nullptr_t to any pointer...
How to enumerate an enum with String type?
...ateEnum<T: Hashable>(_: T.Type) -> GeneratorOf<T> {
var cast: (Int -> T)!
switch sizeof(T) {
case 0: return GeneratorOf(GeneratorOfOne(unsafeBitCast((), T.self)))
case 1: cast = { unsafeBitCast(UInt8(truncatingBitPattern: $0), T.self) }
case 2: cast ...
How can I truncate a double to only two decimal places in Java?
...
If, for whatever reason, you don't want to use a BigDecimal you can cast your double to an int to truncate it.
If you want to truncate to the Ones place:
simply cast to int
To the Tenths place:
multiply by ten
cast to int
cast back to double
and divide by ten.
Hundreths place
mult...
Boolean vs boolean in Java
...e (bar)?1:0 illustrates that bar (boolean) cannot be implicitly converted (casted) into an int. I am bringing this up not to illustrate the details of implementation behind JVM, but to point out that in terms of low level considerations (as memory size) one does have to prefer values over type safet...
What are the advantages of using nullptr?
...s. Unlike C, C++ is a strongly typed language (C does not require explicit cast from void* to any type, while C++ mandates a explicit cast). This makes the definition of NULL specified by C standard useless in many C++ expressions. For example:
std::string * str = NULL; //Case 1
void (A::*p...
Why does Math.Floor(Double) return a value of type Double?
...ow that the value will actually be within the range of int or long, so you cast it:
double d = 1000.1234d;
int x = (int) Math.Floor(d);
but the onus for that cast is on the developer, not on Math.Floor itself. It would have been unnecessarily restrictive to make it just fail with an exception for...
PHP - Move a file into a different folder on the server
...ink function in PHP but have since been told that this can be quite risky and a security issue. (Previous code below:)
8 A...