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How can I add reflection to a C++ application?
...ow to iterate over the fields we use the visitor pattern. We create an MPL range from 0 to the number of fields, and access the field data at that index. Then it passes the field data on to the user-provided visitor:
struct field_visitor
{
template<class C, class Visitor, class I>
voi...
Generator Expressions vs. List Comprehension
...tended with lists, and generators are not quite iterables. a = (x for x in range(0,10)), b = [1,2,3] for instance. a.extend(b) throws an exception. b.extend(a) will evaluate all of a, in which case there's no point in making it a generator in the first place.
– Slater Victoroff...
Take the content of a list and append it to another list
...instead of
list2.append(list1)
Here's the difference:
>>> a = range(5)
>>> b = range(3)
>>> c = range(2)
>>> b.append(a)
>>> b
[0, 1, 2, [0, 1, 2, 3, 4]]
>>> c.extend(a)
>>> c
[0, 1, 0, 1, 2, 3, 4]
Since list.extend() accepts an ar...
How to know what the 'errno' means?
...roken pipe
33 EDOM Numerical argument out of domain
34 ERANGE Numerical result out of range
35 EDEADLK Resource deadlock avoided
35 EDEADLOCK Resource deadlock avoided
36 ENAMETOOLONG File name too long
37 ENOLCK No locks av...
Android and setting width and height programmatically in dp units
...Retrieve a dimensional for a particular resource ID for use as a size
in raw pixels. This is the same as getDimension(int), except the
returned value is converted to integer pixels for use as a size. A
size conversion involves rounding the base value, and ensuring that a
non-zero base value ...
How to sum up elements of a C++ vector?
...gin(), vector.end(), [&] (int n) {
sum_of_elems += n;
});
Using a range-based for loop (thanks to Roger Pate):
for (auto& n : vector)
sum_of_elems += n;
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Find (and kill) process locking port 3000 on Mac
...
Another tip is to add -P to the lsof command so that the raw port is visible in the output: lsof -P -i:3000
– Jason Axelson
Jul 22 '16 at 2:06
...
What does a b prefix before a python string mean?
...s notation.
bytes objects basically contain a sequence of integers in the range 0-255, but when represented, Python displays these bytes as ASCII codepoints to make it easier to read their contents. Any bytes outside the printable range of ASCII characters are shown as escape sequences (e.g. \n, \x...
TextEnhancer拓展 - 增强App中的文本格式 - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
...tTextMasking:Set text masking on a TextView with dots within the specified range. Parameters: start , end (int) - start and end indices of the range to mask with dots.
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[size=15.008px]SetMarqueeEnabled:Enable or disable the marquee effec...
Java 8 Stream and operation on arrays
...
int[] a = ...
int[] b = ...
int[] result = new int[a.length];
IntStream.range(0, a.length)
.forEach(i -> result[i] = a[i] * b[i]);
EDIT
Commenter @Holger points out you can use the map method instead of forEach like this:
int[] result = IntStream.range(0, a.length).map(i -> a[i...