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What is the difference between the HashMap and Map objects in Java?
...s using the "Map" interface restricts you to only those methods unless you cast the collection back from Map to HashMap (which COMPLETELY defeats the purpose).
Often what you will do is create an object and fill it in using it's specific type (HashMap), in some kind of "create" or "initialize" meth...
How do I select a random value from an enumeration?
...lues from Type provided
.OfType<Enum>() // casts to Enum
.OrderBy(e => Guid.NewGuid()) // mess with order of results
.FirstOrDefault(); // take first item in result
}
}
public static class Program
{
public enum SomeEnum
...
Get PHP class property by string
...t actually succeed, although this is likely to be a bug. $name is silently cast to an integer. In the case of a non-numeric string this is 0. Then this string index of the value of $property is used as the property name. If $property holds the value "abc", then this will refer to the property $this-...
Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
... uint64_t* buffer = new uint64_t[size/8];
char* charbuffer=reinterpret_cast<char*>(buffer);
for (unsigned i=0;i<size;++i) charbuffer[i]=rand()%256;
uint64_t count,duration;
chrono::time_point<chrono::system_clock> startP,endP;
{
uint64_t c0 = 0;
uint64_t c...
json_decode to array
...
This is a late contribution, but there is a valid case for casting json_decode with (array).
Consider the following:
$jsondata = '';
$arr = json_decode($jsondata, true);
foreach ($arr as $k=>$v){
echo $v; // etc.
}
If $jsondata is ever returned as an empty string (as in my ...
Getting mouse position in c#
...g System.Windows; // Or use whatever point class you like for the implicit cast operator
/// <summary>
/// Struct representing a point.
/// </summary>
[StructLayout(LayoutKind.Sequential)]
public struct POINT
{
public int X;
public int Y;
public static implicit operator Poi...
Swift double to string
Before I updated xCode 6, I had no problems casting a double to a string but now it gives me an error
14 Answers
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When do I use fabs and when is it sufficient to use std::abs?
...preal there are cases with hard "ambiguous overload" messages - abs(static_cast<T>(x)) isn't always solving that.
When abs is ambiguous, there are chances that fabs is working as expected. For sqrt I found no such simple escape.
Since weeks I'm hard struggling on C++ "not existing problems". ...
How to convert String object to Boolean Object?
...it has a performance cost.
I suggest to use it only when you would have to cast yourself, not when the cast is avoidable.
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Cannot use object of type stdClass as array?
... you can do something like this:
$result = json_decode($json, true);
Or cast the object to an array:
$result = (array) json_decode($json);
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