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Ruby on Rails: Where to define global constants?
...
@Zabba If the allocation of a single array makes a noticable difference for your app, you probably shouldn't be using Ruby in the first place... That said, using a method and returning a completely new array each time can have a couple of ...
Collections.emptyMap() vs new HashMap()
...ameters, it's certainly a bit wasteful to create a HashMap, which involves allocating an array, when you could just pass in the 'Empty Map' which is effectively a constant, the way it's implemented in java.util.Collections.
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What happens if I define a 0-size array in C/C++?
...ray {
size_t size;
int content[];
};
The idea is that you would then allocate it so:
void foo(size_t x) {
Array* array = malloc(sizeof(size_t) + x * sizeof(int));
array->size = x;
for (size_t i = 0; i != x; ++i) {
array->content[i] = 0;
}
}
You might also use it staticall...
How do you get the index of the current iteration of a foreach loop?
... element.
The new { i, value } is creating a new anonymous object.
Heap allocations can be avoided by using ValueTuple if you're using C# 7.0 or later:
foreach (var item in Model.Select((value, i) => ( value, i )))
{
var value = item.value;
var index = item.i;
}
You can also elimina...
Difference between ref and out parameters in .NET [duplicate]
...s, the advantages of out parameters being that callers need not pass a pre-allocated object in cases where it is not needed by the method being called - this avoids both the cost of allocation, and any cost that might be associated with marshaling (more likely with COM, but not uncommon in .NET).
...
proper way to sudo over ssh
...ssh -t user@server "sudo script"
See man ssh:
-t Force pseudo-tty allocation. This can be used to execute arbi-
trary screen-based programs on a remote machine, which can be
very useful, e.g., when implementing menu services. Multiple -t
options force tty alloca...
In c++ what does a tilde “~” before a function name signify?
...tc.
Here's a description from ibm.com:
Destructors are usually used to deallocate memory and do other cleanup for a class object and its class members when the object is destroyed. A destructor is called for a class object when that object passes out of scope or is explicitly deleted.
See https:/...
String's Maximum length in Java - calling length() method
...ver, there probably are going to be other limitations, such as the maximum allocatable size for an array.
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Using a BOOL property
...fit to using properties with primitive types. @property is used with heap allocated NSObjects like NSString*, NSNumber*, UIButton*, and etc, because memory managed accessors are created for free. When you create a BOOL, the value is always allocated on the stack and does not require any special ac...
How to delete a row by reference in data.table?
...nce yet.
data.table can add and delete columns by reference since it over-allocates the vector of column pointers, as you know. The plan is to do something similar for rows and allow fast insert and delete. A row delete would use memmove in C to budge up the items (in each and every column) after t...