vector_to_pointers.hpp

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#ifndef VECTOR_TO_POINTERS
#define VECTOR_TO_POINTERS
 
#include "macros.hpp"
 
#include <vector>
 
namespace scran {
 
template<typename T>
std::vector<T*> vector_to_pointers(std::vector<std::vector<T> >& input) {
    std::vector<T*> output(input.size());
    auto oIt = output.begin();
    for (auto& i : input) {
        *oIt = i.data();
        ++oIt;
    }
    return output;
}
 
template<typename T>
std::vector<const T*> vector_to_pointers(const std::vector<std::vector<T> >& input) {
    std::vector<const T*> output(input.size());
    auto oIt = output.begin();
    for (auto& i : input) {
        *oIt = i.data();
        ++oIt;
    }
    return output;
}
 
template<typename T>
std::vector<std::vector<T*> > vector_to_pointers(std::vector<std::vector<std::vector<T> > >& input) {
    std::vector<std::vector<T*> > output;
    output.reserve(input.size());
    for (auto& current : input) {
        output.emplace_back(vector_to_pointers(current));
    }
    return output;
}
 
// Convenience method to get the pointers if each middle vector contains exactly one inner vector.
// This allows us to create pointer vectors in the same format as the first vector_to_pointers overload.
template<typename T>
std::vector<T*> vector_to_front_pointers(std::vector<std::vector<std::vector<T> > >& input) {
    std::vector<T*> ptrs;
    ptrs.reserve(input.size());
    for (auto& current : input) {
        ptrs.push_back(current.front().data()); // first vector from each element.
    }
    return ptrs;
}
 
}
 
#endif