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How to check if std::map contains a key without doing insert?
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Your desideratum,map.contains(key), is scheduled for the draft standard C++2a. In 2017 it was implemented by gcc 9.2. It's also in the current clang.
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What is the fastest way to get the value of π?
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In the interests of completeness, a C++ template version, which, for an optimised build, will compute an approximation of PI at compile time, and will inline to a single value.
#include <iostream>
template<int I>
struct sign
{
enum {value = (I...
How is TeamViewer so fast?
...wyse, YMMV.
Also the choice of a JIT compiled runtime over something like C++ might take a slice from your performance edge, especially in memory constrained machines (a lot of performance tuning goes to the toilet when windows start using the pagefile intensively). And you will need memory to keep...
Does Python have “private” variables in classes?
...riable is protected by some scope. A similar concept is const functions in C++. I know that member variables weren't changed in there and so I don't even look at that method as the potential cause of a bad variable setting. Although it can make subsequent development of class extensions/adding featu...
“On-line” (iterator) algorithms for estimating statistical median, mode, skewness, kurtosis?
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FYI: the p-square algorithm is in C++ boost: <boost/accumulators/statistics/weighted_p_square_cumul_dist.hpp>.
– Neil G
Mar 27 '14 at 4:21
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Given a number, find the next higher number which has the exact same set of digits as the original n
..."".join(x)) for x in
itertools.permutations(str(ii))) if v>ii)
In C++ you could make the permutations like this: https://stackoverflow.com/a/9243091/1149664 (It's the same algorithm as the one in itertools)
Here's an implementation of the top answer described by Weeble and BlueRaja, (other...
What does “static” mean in C?
...call stack.
And to answer your second question, it's not like in C#.
In C++, however, static is also used to define class attributes (shared between all objects of the same class) and methods. In C there are no classes, so this feature is irrelevant.
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How to unit test an object with database queries
...place, we were then able to do something like this in our code (we work in C++, but I'm sure you get the idea):
GetDatabase().ExecuteSQL( "INSERT INTO foo ( blah, blah )" )
At normal run time, GetDatabase() would return an object that fed all our sql (including queries), via ODBC directly to the d...
Which is the fastest algorithm to find prime numbers?
Which is the fastest algorithm to find out prime numbers using C++? I have used sieve's algorithm but I still want it to be faster!
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What is the difference between JavaScript and ECMAScript?
...nguage? The standard defines the language. If some language implements the C++ standard, it is called C++, not something else (exactly because it implements that standard). So I still have the same question... what's the difference?
– Neme
Jan 26 '18 at 11:11
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