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Regular cast vs. static_cast vs. dynamic_cast [duplicate]
...called C-style cast. A C-style cast is basically identical to trying out a range of sequences of C++ casts, and taking the first C++ cast that works, without ever considering dynamic_cast. Needless to say, this is much more powerful as it combines all of const_cast, static_cast and reinterpret_cast,...
What is the maximum amount of RAM an app can use?
...ndroid 3.0, apps can request a "large heap", usually in the hundreds of MB range, but that's considered poor form for most apps.
Furthermore, I noticed that some apps of mine crash with an OutOfMemoryException when using around 30-40 Megabytes.
Bear in mind that the Android garbage collector i...
How does C compute sin() and other math functions?
...software algorithm is as fast as possible and also accurate over the whole range of x values, so the library implements several different algorithms, and its first job is to look at x and decide which algorithm to use.
When x is very very close to 0, sin(x) == x is the right answer.
A bit further ...
Is there any way to put malicious code into a regular expression?
...at most HTTP servers provide.
There are various ways to implement these, ranging form a simple alarm(N) at the C level, to some sort of try {} block the catches alarm‐type exceptions, all the way to spawning off a new thread that’s specially created with a timing constraint built right into it...
Why are these constructs using pre and post-increment undefined behavior?
... imposes no requirements
and notes that:
Possible undefined behavior ranges from ignoring the situation completely with unpredictable results, to behaving during translation or program execution in a documented manner characteristic of the environment (with or without the issuance of a diagnos...
What is the difference between Elastic Beanstalk and CloudFormation for a .NET project?
...ons. AWS CloudFormation is a convenient provisioning mechanism for a broad range of AWS and third party resources. It supports the infrastructure needs of many different types of applications such as existing enterprise applications, legacy applications, applications built using a variety of AWS res...
How many socket connections can a web server handle?
...application. In theory, this is solved by using all addresses in 127.*.*.* range, but in practice I don't know if this is an available option.
– Todd
Jan 30 '17 at 22:52
...
best practice to generate random token for forgot password
...is insecure and only offers about 2^60 possible outputs -- well within the range of a brute force search in about a week's time for a low-budget attacker:
mt_rand() is predictable (and only adds up to 31 bits of entropy)
uniqid() only adds up to 29 bits of entropy
md5() doesn't add entropy, it jus...
Strip HTML from strings in Python
...xception.
Numeric HTML entities specifying code points outside the Unicode range acceptable by Python (such as, on some systems, characters outside the Basic Multilingual Plane) will cause a ValueError exception.
Security note: Do not confuse HTML stripping (converting HTML into plain text) with H...
how do I initialize a float to its max/min value?
... negative number and FLT_MAX (or DBL_MAX) for positive. This gives you the range of possible float (or double) values.
You probably don't want to use FLT_MIN; it corresponds to the smallest magnitude positive number that can be represented with a float, not the most negative value representable wit...