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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 &...
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>]
share
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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 {...
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...
Plot smooth line with PyPlot
...rt spline
# 300 represents number of points to make between T.min and T.mam>x m>
m>x m>new = np.linspace(T.min(), T.mam>x m>(), 300)
power_smooth = spline(T, power, m>x m>new)
plt.plot(m>x m>new,power_smooth)
plt.show()
spline is deprecated in scipy 0.19.0, use BSpline class instead.
Switching from spline to B...
How to color System.out.println output? [duplicate]
...ay not be able to color Window's cmd prompt, but it should work in many unim>x m> (or unim>x m>-like) terminals.
Also, note that some terminals simply won't support some (if any) ANSI escape sequences and, especially, 24-bit colors.
Usage
Please refer to the section Curses at the bottom for the best soluti...
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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Convert a list of objects to an array of one of the object's properties
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You are looking for
MyList.Select(m>x m>=>m>x m>.Name).ToArray();
Since Select is an Em>x m>tension method make sure to add that namespace by adding a
using System.Linq
to your file - then it will show up with Intellisense.
...