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A sample of meta and a sample of functional programming in c++
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| #include <iostream> | |
| #include <vector> | |
| #include <ranges> | |
| #include <algorithm> | |
| using namespace std; | |
| int mod_by_six(int val); | |
| int main() | |
| { | |
| vector<vector<int>> mtx = { | |
| {112, 42, 83, 119}, | |
| {56, 125, 56, 49}, | |
| {15, 78, 101, 43}, | |
| {62, 98, 114, 108}}; | |
| function<vector<int>(vector<int>)> apply_mod = [](vector<int> vec) | |
| { | |
| transform(vec.begin(), vec.end(), vec.begin(), mod_by_six); | |
| return vec; | |
| }; | |
| auto rs = mtx | ranges::views::transform(apply_mod); | |
| for (auto v : rs) | |
| { | |
| for (auto nv : v) | |
| cout << nv << " "; | |
| cout << endl; | |
| } | |
| return 0; | |
| } | |
| int mod_by_six(int val) | |
| { | |
| if (val % 6 == 0) | |
| return 6; | |
| else if (val % 2 == 0) | |
| return 2; | |
| else if (val % 3 == 0) | |
| return 3; | |
| else | |
| return 0; | |
| }; |
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| #include <iostream> | |
| template <long int N> | |
| struct MetaFactorial | |
| { | |
| enum | |
| { | |
| value = N * MetaFactorial<N - 1>::value | |
| }; | |
| }; | |
| template <> | |
| struct MetaFactorial<0> | |
| { | |
| enum | |
| { | |
| value = 1 | |
| }; | |
| }; | |
| int main() | |
| { | |
| std::cout << "Welcome to metaprogramming paradigm!" << std::endl | |
| << "Here everything is already calculated! and is ready for runtime." << std::endl | |
| << "It is the power of C++ templates, preprocessor macros, etc which" | |
| << " makes the C++ able to have metaprogramming paradigm." << std::endl | |
| << std::endl; | |
| std::cout << "The Factorial(10): " << MetaFactorial<10>::value << std::endl; | |
| std::cout << "The Factorial(13): " << MetaFactorial<13>::value << std::endl; | |
| } |
Author
farhangamary
commented
Mar 26, 2024
Author
$ g++ -std=c++20 -o func functnl.cpp
$ ./func
2 6 0 0
2 0 2 0
3 6 0 0
2 2 6 6
$
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