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kernel stack and user space stack
...y variables on the stack, including
huge structures and thousand-element arrays.
This behavior is legal because user-space has
a large stack that can dynamically grow.
The kernel stack is neither large nor dynamic; it is small and fixed in size.
The exact size of the kernel’s stack varie...
What is the motivation for bringing Symbols to ES6?
...r I still don't know why would I use object with symbol keys instead of an array. If I have multiple person like {"peter":"pan"} {"john":"doe"} it feels bad for me to put them in one object. For the same reason as I don't make classes with duplicated properties like personFirstName1, personFirstName...
Is it possible to specify your own distance function using scikit-learn K-Means Clustering?
...w, class Kmeans below.
"""
if not issparse(X):
X = np.asanyarray(X) # ?
centres = centres.todense() if issparse(centres) \
else centres.copy()
N, dim = X.shape
k, cdim = centres.shape
if dim != cdim:
raise ValueError( "kmeans: X %s and centres %s must...
Why should I use the keyword “final” on a method parameter in Java?
...ping programmers to avoid dumb mistakes such as reading past the end of an array, Java should have been designed to automatically enforce all parameter/argument variables as 'final'. In other words, Arguments should not be variables. But hindsight is 20/20 vision, and the Java designers had their ha...
Why shouldn't I use PyPy over CPython if PyPy is 6.3 times faster?
...umerics. For numerics, Python is just used to ferry around pointers to big arrays. So PyPy being "as fast as C" means "your pointers+metadata get moved around as fast as C". Not a big deal. Then why bother with Python at all? Go look at the function signatures in cblas and lapacke.
...
Why does casting int to invalid enum value NOT throw exception?
...een a different solution; I would rather have had the ability to make "bit array" integer types and "a set of distinct value" types as two different language features rather than conflating them both into "enum". But that's what the original language and framework designers came up with; as a result...
How is “=default” different from “{}” for default constructor and destructor?
...structor
is non-trivial, that constructor is called.
— if T is an array type,
then each element is value-initialized; — otherwise, the object is
zero-initialized.
For example:
#include <iostream>
class A {
public:
A(){}
int i;
int j;
};
class B {
public:...
What is the difference between shallow copy, deepcopy and normal assignment operation?
...that contains other lists (you could also describe it as a two-dimensional array).
If you run a "shallow copy" on e, copying it to e1, you will find that the id of the list changes, but each copy of the list contains references to the same three lists -- the lists with integers inside. That means ...
C++11 rvalues and move semantics confusion (return statement)
...ed in the copy constructor and data is allocated, but the bulk of the data array is only copied by copying the pointer (essentially). The copy elision avoids 100% of all copies.
– Mark Lakata
Dec 11 '14 at 1:26
...
What's the role of GetHashCode in the IEqualityComparer in .NET?
...oor choice for iterating over though. Internally, a dictionary contains an array of buckets, where values can be stored. When you add a Key and Value to a dictionary, the GetHashCode method is called on the Key. The hashcode returned is used to determine the index of the bucket in which the Key/Valu...