Created
June 20, 2017 13:06
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#include <iostream> | |
#include <vector> | |
#include <algorithm> | |
#include <numeric> | |
template<typename T> | |
class MultidimArray { | |
public: | |
MultidimArray(std::initializer_list<std::size_t> sizes) : sizes{sizes}, data( | |
std::accumulate(std::begin(sizes), std::end(sizes), static_cast<std::size_t>(1), [](std::size_t i, std::size_t j) { return i * j; }) | |
) { | |
} | |
template<typename... Types> | |
T& operator()(Types... indices) { | |
return(*this)({static_cast<std::size_t>(indices)...}); | |
} | |
T& operator()(std::initializer_list<std::size_t> params) { | |
auto begin = std::begin(params); | |
std::size_t ret = *begin; | |
++begin; | |
std::size_t current_index = 0; | |
for (auto it = begin; it != std::end(params); ++it) { | |
ret = ret * sizes[++current_index] + *it; | |
} | |
return data[ret]; | |
} | |
std::vector<std::size_t> sizes; | |
std::vector<T> data; | |
}; | |
int main(int argc, char *argv[]) | |
{ | |
// A simple 2x2 matrix | |
MultidimArray<double> array{4,3,2}; | |
for (std::size_t i = 0; i < 4*3*2; i++) { | |
array.data[i] = static_cast<double>(i); | |
} | |
std::cout | |
<< array(0,0,0) << " " | |
<< array(0,0,1) << " " | |
<< array(0,1,0) << " " | |
<< array(0,1,1) << std::endl; | |
return 0; | |
} |
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