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can be delete of a element in a static array be O(1)?


can be delete of a element in a static array be O(1)?

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can be delete of a element in a static array be O(1)?
Tag : java , By : kennystone
Date : January 11 2021, 03:32 PM

fixed the issue. Will look into that further Not exactly. The length of an array in Java is fixed. You can still delete objects at the end of the array by keeping a separate counter for the number of items in the array. Then you can "delete" the last element by setting it to null and manually reducing the counter. But the actual length of the array will still be same, the entries above the counter will just be empty.

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How do I pass element of static array to non static method?


Tag : chash , By : liquidx
Date : March 29 2020, 07:55 AM
Does that help Your code as it is is fine, however 'An object reference is required for the non-static field, method, or property' occurs when you try to call instance method, or access a non-static field/property on something other than an instance of a class, say from a static method. For example:
class MyClass
{
    private int imNotStatic;

    public static void Bar()
    {
        // This will give you your 'An object reference is required` compile 
        // error, since you are trying to call the instance method SomeMethod
        // from a static method, as there is no 'this' to call SomeMethod on.
        SomeMethod(5);

        // This will also give you that error, as you are calling SomeMethod as
        // if it were a static method.
        MyClass.SomeMethod(42);

        // Again, same error, there is no 'this' to read imNotStatic from.
        imNotStatic = -1;
    }

    public void SomeMethod(int x)
    {
        // Stuff
    }
}

How do I use a static array element as an index to a static array of objects that are of different template instantiatio


Tag : cpp , By : user171752
Date : March 29 2020, 07:55 AM
it fixes the issue For some reason using constexpr instead of const in the following line works for me. I don't know why yet. See a question I asked on the subject.
// static const size_t ARRAYSIZES[2] =   // Does not work
static constexpr size_t ARRAYSIZES[2] =  // Works
{
    1,
    2
};
static DataParent DataTable[ 2 ] =
{
    DataChild< 1 >(&size1Array),
    DataChild< 2 >(&size2Array)            
};
static DataParent* DataTable[ 2 ] =
{
    new DataChild< 1 >(&size1Array),
    new DataChild< 2 >(&size2Array)            
};
static std::unique_ptr<DataParent> DataTable[ 2 ] =
{
    new DataChild< 1 >(&size1Array),
    new DataChild< 2 >(&size2Array)            
};
static constexpr size_t ARRAYSIZES[2] =  { ... };
static const size_t ARRAYSIZES[2] =  { ... };
double read_double()
{
   double v;
   std::cin >> v;
   return v;
}

const double v1 = read_double();
constexpr double v2 = read_double();

Delete element from a static array


Tag : arrays , By : Stuka
Date : March 29 2020, 07:55 AM
like below fixes the issue When you declare a static array you tell the compiler that the memory for the whole array should be allocated and retained until the program is terminated (if allocated in global space).
You cannot change the size of a static array. This is the purpose why dynamic arrays are there in Delphi.

Delete/unset an array element matching a key/value of another array element [PHP]


Tag : php , By : Pavel K.
Date : March 29 2020, 07:55 AM
Any of those help I have the following multidimensional array: , Try this:
<?php
$messages = array(

  'message1'=>array(
    'type'=>'voice',
    'call-id'=>'11',
    'id'=>'message1'
  ),
  'message2'=>array(
    'type'=>'voice',
    'call-id'=>'44',
    'id'=>'message2'
  ),
  'message3'=>array(
    'type'=>'text',
    'call-id'=>'44',
    'id'=>'message3'
  ),
  'message4'=>array(
    'type'=>'text',
    'call-id'=>'55',
    'id'=>'message4'
  ),
  'message5'=>array(
    'type'=>'voice',
    'call-id'=>'55',
    'id'=>'message5'
  ),

);

$unique = [];

foreach ($messages as $value) {
    if ($value['type'] == 'text') {
        $unique[$value['call-id']] = $value;
    // so text comes first and override any previous value with the same call-id
    } else if (!array_key_exists($value['call-id'], $unique)) {
        $unique[$value['call-id']] = $value;
    // will be added only if no same call-id and will be overridden if same call-id with type text after
    }
}

foreach ($unique as $value) {
    $array[$value['id']] = $value;
}

echo '<pre>';
print_r($array);
    Array
(
    [message1] => Array
        (
            [type] => voice
            [call-id] => 11
            [id] => message1
        )

    [message3] => Array
        (
            [type] => text
            [call-id] => 44
            [id] => message3
        )

    [message4] => Array
        (
            [type] => text
            [call-id] => 55
            [id] => message4
        )

)

How to remove/delete particular member or element from static "Array of TPoint"?


Tag : arrays , By : user134570
Date : March 29 2020, 07:55 AM
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