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Why does the arrow (->) operator in C exist?
...mpletely different depending on whether you're indexing a multidimensional array or an array of pointer and anything could be a macro hidinging anything (the uppercasing naming convention helps there but C doesn't).
– PSkocik
Jun 13 '18 at 11:28
...
Loading cross-domain endpoint with AJAX
...n = $_SERVER['HTTP_ORIGIN']; //allow multiple domains
$allowed_domains = array(
'http://codesheet.org',
'http://stackoverflow.com'
);
if (in_array($http_origin, $allowed_domains))
{
header("Access-Control-Allow-Origin: $http_origin");
}
...
Can an enum class be converted to the underlying type?
...ression is required:
int a[to_integral(my_fields::field)]; //declaring an array
std::array<int, to_integral(my_fields::field)> b; //better!
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Convert Go map to json
...g/json/#Unmarshal You could use a slice instead, which will map to a JSON array. Also: always check for errors ;)
– seong
Jul 9 '14 at 11:50
...
Purpose of Unions in C and C++
... by either name:
vec.x=vec.y=vec.z=1.f ;
or by integer access into the array
for( int i = 0 ; i < 3 ; i++ )
vec.elts[i]=1.f;
In some cases, accessing by name is the clearest thing you can do. In other cases, especially when the axis is chosen programmatically, the easier thing to do is ...
Why the switch statement cannot be applied on strings?
...ly support strings as a type. It does support the idea of a constant char array but it doesn't really fully understand the notion of a string.
In order to generate the code for a switch statement the compiler must understand what it means for two values to be equal. For items like ints and enum...
make_unique and perfect forwarding
... STL) has a better solution for make_unique, which works correctly for the array version.
#include <memory>
#include <type_traits>
#include <utility>
template <typename T, typename... Args>
std::unique_ptr<T> make_unique_helper(std::false_type, Args&&... args)...
What is the result of % in Python?
...d it is very important in computer science. It is also used to wrap around arrays, allowing you to increase the index and use the modulus to wrap back to the beginning after you reach the end of the array.
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HashMap get/put complexity
...te hashCode() of the lookup element, which means we might have to traverse arrays and lists in our algorithm.
Lets assume that the size of all of the above arrays/lists is k.
Then, HashMap<String, V> and HashMap<List<E>, V> will have O(k) amortised complexity and similarly, O(k +...
pyplot scatter plot marker size
...ter denotes the markersize**2. As the documentation says
s : scalar or array_like, shape (n, ), optional
size in points^2. Default is rcParams['lines.markersize'] ** 2.
This can be taken literally. In order to obtain a marker which is x points large, you need to square that number and give i...