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When and why will a compiler initialise memory to 0xCD, 0xDD, etc. on malloc/free/new/delete?
...ting outside the allocation,
but to also identify mixing alignment-specific
allocation/deallocation routines with the regular
ones.
0xFD Fence Memory Also known as "no mans land." This is used to wrap
...
How to create the most compact mapping n → isprime(n) up to a limit N?
...):
if n % i == 0:
return False
return True
And I mixed a few ideas from the other answers into a new one:
def is_prime_4(n):
if n <= 1: # negative numbers, 0 or 1
return False
if n <= 3: # 2 and 3
return True
if n % 2 == ...
Difference between array_map, array_walk and array_filter
...mentation,
bool array_walk ( array &$array , callback $funcname [, mixed $userdata ] ) <-return bool
array_walk takes an array and a function F and modifies it by replacing every element x with F(x).
array array_map ( callback $callback ,
array $arr1 [, array $... ] )<-return...
C++ auto keyword. Why is it magic?
...
Notes
Until C++11, auto had the semantic of a storage duration specifier.
Mixing auto variables and functions in one declaration, as in auto f() -> int, i = 0; is not allowed.
For more info : http://en.cppreference.com/w/cpp/language/auto
...
To underscore or to not to underscore, that is the question
... you the private fields and all types available from the linked assemblies mixed with the rest of the instance members
this-notation gives you a clear answer, by typing "this" all you see is the list of members and nothing else
Ambiguity
Sometimes you have to deal with the code without help of th...
How many socket connections can a web server handle?
...
A bit of a mixed answer. The OP appears to be referring to a best case scenario, and including how would be beneficial, rather than finding a worst case and then referring to an article which may have the solution. Noting disk bottlenec...
best practice to generate random token for forgot password
...id() only adds up to 29 bits of entropy
md5() doesn't add entropy, it just mixes it deterministically
Since a 56-bit DES key can be brute-forced in about 24 hours, and an average case would have about 59 bits of entropy, we can calculate 2^59 / 2^56 = about 8 days. Depending on how this token veri...
Coroutine vs Continuation vs Generator
...s in the language or emulated somehow, lexing and parsing code needs to be mixed together even though they're really two separate concerns. But using a coroutine, you can separate out the lexing and parsing code.
(I'm going to brush over the difference between symmetric and asymmetric coroutines. S...
Declaring variables inside loops, good practice or bad practice?
...he name of the variable is a bit "generic" (like "i"), there is no risk to mix it with another variable of same name somewhere later in your code (can also be mitigated using the -Wshadow warning instruction on GCC)
The compiler knows that the variable scope is limited to inside the loop, and theref...
Exploitable PHP functions
...s. A Study In Scarlet and RATS. I have also added some of my own to the mix and people on this thread have helped out.
Edit: After posting this list I contacted the founder of RIPS and as of now this tools searches PHP code for the use of every function in this list.
Most of these function call...