Cpp20Features/to_array.cpp at master · icEngineer-tech/Cpp20Features · GitHub

30 lines (26 loc) · 806 Bytes

// convert a C_Style array into the new Cpp_Style array (the container of STL)

#include <iostream>

#include <array>

//---------------------------------------------------------- (2)

template<typename T, std::size_t N, std::size_t...S>

consteval std::array<T, N>to_array_impl(T (&a)[N], std::index_sequence<S...>)

{

return { { a[S]... } };

}

template<typename T, std::size_t N>

consteval std::array<T, N> to_array(T (&a)[N])

{

return to_array_impl(a, std::make_index_sequence<N>());

}

//-----------------------------------------------------------

int main()

{

// this what the standard gives us (1)

int tab[5]{ 14,8,2,0,4 };

std::array<int, 5> io = std::to_array(tab);

for (auto i : io)

std::cout << i << " ";

// look at this beauty of C++ aha

//same code can go here for (2)

return 0;

}

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