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Difference between Covariance & Contra-variance
...ther. More specifically, a mapping can be covariant or contravariant with respect to a relation on that set.
Consider the following two subsets of the set of all C# types. First:
{ Animal,
Tiger,
Fruit,
Banana }.
And second, this clearly related set:
{ IEnumerable<Animal>,
IEn...
What happens when a computer program runs?
...e most common functions are PUSH and POP to add and remove items from it, respectively. It is commonly used for function-local variables (so-called "automatic storage"), function arguments, return addresses, etc. (more below)
A "heap" is just a nickname for a chunk of memory that can be allocated ...
When exactly is it leak safe to use (anonymous) inner classes?
... new definition and simply override the appropriate methods. In all other respects it is a Inner Class, which means that it keeps an implicit reference to its container.
Runnables and Activities/Views
Yay! This section can be short! Due to the fact that Runnables run outside of the current thread,...
Any reason why scala does not explicitly support dependent types?
...is a lot closer to these other languages than is typically acknowledged.
Despite the terminology, dependent sum types (also known as Sigma types) are simply a pair of values where the type of the second value is dependent on the first value. This is directly representable in Scala,
scala> trait...
How can I view the source code for a function?
...s are asterisked" means the function is not exported from its package's namespace. You can still view its source code via the ::: function (i.e. stats:::t.ts), or by using getAnywhere(). getAnywhere() is useful because you don't have to know which package the function came from.
> getAnywhere(...
How can I link to a specific glibc version?
...ot recommended (Drepper). You will have trouble with non-trivial programs, esp anything that uses NSS (workaround in the FAQ).
– mr.spuratic
Jul 18 '14 at 16:39
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What does multicore assembly language look like?
...rocessor:
General purpose registers (EAX, EBX, ECX, EDX, ESI, EDI, ESP, and EBP)
Segment registers (CS, DS, SS, ES, FS, and GS)
EFLAGS and EIP registers. Note that the CS and EIP/RIP registers for each logical processor point to the
instruction stream for the thread being executed by t...
What are the differences between git branch, fork, fetch, merge, rebase and clone?
...changes by saving the entire file. It is also different from SVN in this respect as you could go to any individual version without 'recreating' it through delta changes.
Git doesn't 'lock' files at all and thus avoids the 'exclusive lock' functionality for an edit (older systems like pvcs come ...
How to run a program without an operating system?
...
mov %ax, %ds
mov %ax, %es
mov %ax, %ss
mov $__stack_top, %esp
cld
call main
linker.ld
ENTRY(mystart)
SECTIONS
{
. = 0x7c00;
.text : {
entry.o(.text)
*(.text)
*(.data)
*(.rodata)
__bss_start = .;
/* COMMON vs BSS: https://stackoverflow.com/questio...
Functional, Declarative, and Imperative Programming [closed]
...tive programming. Functional composition can be contrasted with subtyping, especially with respect to the Expression Problem, where extension can be achieved by either adding subtypes or functional decomposition. Extension can be a mix of both methodologies.
Functional programming usually makes the ...