fetch.hpp

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#ifndef TATAMI_TEST_FETCH_HPP
#define TATAMI_TEST_FETCH_HPP
 
#include <vector>
#include <cstddef>
 
#include "tatami/base/Extractor.hpp"
#include "tatami/base/SparseRange.hpp"
#include "tatami/utils/copy.hpp"
 
namespace tatami_test {
 
template<typename Value_, typename Index_>
void trim_sparse(const tatami::SparseRange<Value_, Index_>& raw, std::vector<Value_>& output_v, std::vector<Index_>& output_i) {
    tatami::copy_n(raw.value, raw.number, output_v.data());
    output_v.resize(raw.number);
    tatami::copy_n(raw.index, raw.number, output_i.data());
    output_i.resize(raw.number);
}
template<typename Value_, typename Index_>
std::vector<Value_> fetch(tatami::MyopicDenseExtractor<Value_, Index_>& ext, Index_ i, std::size_t number) {
    std::vector<Value_> output(number);
    auto raw = ext.fetch(i, output.data());
    tatami::copy_n(raw, output.size(), output.data());
    return output;
}
 
template<typename Value_, typename Index_>
std::vector<Value_> fetch(tatami::OracularDenseExtractor<Value_, Index_>& ext, std::size_t number) {
    std::vector<Value_> output(number);
    auto raw = ext.fetch(output.data());
    tatami::copy_n(raw, output.size(), output.data());
    return output;
}
 
template<typename Value_, typename Index_>
struct SparseVector {
    SparseVector(size_t n) : value(n), index(n) {}
    std::vector<Value_> value;
 
    std::vector<Index_> index;
};
 
template<typename Value_, typename Index_>
SparseVector<Value_, Index_> fetch(tatami::MyopicSparseExtractor<Value_, Index_>& ext, Index_ i, std::size_t number) {
    SparseVector<Value_, Index_> output(number);
    auto raw = ext.fetch(i, output.value.data(), output.index.data());
    trim_sparse(raw, output.value, output.index);
    return output;
}
 
template<typename Value_, typename Index_>
SparseVector<Value_, Index_> fetch(tatami::OracularSparseExtractor<Value_, Index_>& ext, std::size_t number) {
    SparseVector<Value_, Index_> output(number);
    auto raw = ext.fetch(output.value.data(), output.index.data());
    trim_sparse(raw, output.value, output.index);
    return output;
}
 
}
 
#endif