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Filter git diff by type of change
...ed between the two branches.
From man git-diff
--diff-filter=[ACDMRTUm>X m>B*]
Select only files that are
A Added
C Copied
D Deleted
M Modified
R Renamed
T have their type (mode) changed
U Unmerged
m>X m> Unknown
B have had their pairing Broken
* All-or-none
Any co...
How to use a variable for the key part of a map
...
Use this:
def map = [(A):1, (m>X m>):2]
For the value-part it's even easier, since there is no automagic "convert tem>x m>t to string" happening:
def map = [keyA:A, keym>X m>:m>X m>]
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How can I loop through a C++ map of maps?
... and avoids unnecessary copies.
Some favour replacing the comments with em>x m>plicit definitions of reference variables (which get optimised away if unused):
for(auto const &ent1 : mymap) {
auto const &outer_key = ent1.first;
auto const &inner_map = ent1.second;
for(auto const &...
Check if a class has a member function of a given signature
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I'm not sure if I understand you correctly, but you may em>x m>ploit SFINAE to detect function presence at compile-time. Em>x m>ample from my code (tests if class has member function size_t used_memory() const).
template<typename T>
struct HasUsedMemoryMethod
{
template<typenam...
Is the practice of returning a C++ reference variable evil?
...}
And now the client stores a smart pointer:
std::unique_ptr<int> m>x m> = getInt();
References are also okay for accessing things where you know the lifetime is being kept open on a higher-level, e.g.:
struct immutableint {
immutableint(int i) : i_(i) {}
const int& get() const {...
How to calculate the angle between a line and the horizontal am>x m>is?
...to determine how to calculate the angle between a line and the horizontal am>x m>is?
9 Answers
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What is the Scala annotation to ensure a tail recursive function is optimized?
...on of the bytecode, to work out whether a method has been optimised.
Em>x m>ample:
you could add a @tailrec annotation so that you can be sure that your changes have worked.
import scala.annotation.tailrec
class Factorial2 {
def factorial(n: Int): Int = {
@tailrec def factorialAcc(acc: ...
Does Parallel.ForEach limit the number of active threads?
...art 1000 threads - yes, it will limit how many threads are used. Parallel Em>x m>tensions uses an appropriate number of cores, based on how many you physically have and how many are already busy. It allocates work for each core and then uses a technique called work stealing to let each thread process its...
Remove unwanted parts from strings in a column
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data['result'] = data['result'].map(lambda m>x m>: m>x m>.lstrip('+-').rstrip('aAbBcC'))
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Moving average or running mean
...mylist = [1, 2, 3, 4, 5, 6, 7]
N = 3
cumsum, moving_aves = [0], []
for i, m>x m> in enumerate(mylist, 1):
cumsum.append(cumsum[i-1] + m>x m>)
if i>=N:
moving_ave = (cumsum[i] - cumsum[i-N])/N
#can do stuff with moving_ave here
moving_aves.append(moving_ave)
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