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faster for identical axes (#121)

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Hans Dembinski 2020-05-27 23:28:24 +02:00 committed by GitHub
parent 7f4cb204de
commit 1be4c4b3f2
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1 changed files with 18 additions and 8 deletions
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14
include/boost/histogram/histogram.hpp
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@ -429,6 +429,11 @@ public:
/** Add values of another histogram. /** Add values of another histogram.
This operator is only available if the value_type supports operator+=. This operator is only available if the value_type supports operator+=.
Both histograms must be compatible to be addable. The histograms are compatible, if
the axes are either all identical. If the axes only differ in the states of their
discrete growing axis types, then they are also compatible. The discrete growing
axes are merged in this case.
*/ */
template <class A, class S> template <class A, class S>
#ifdef BOOST_HISTOGRAM_DOXYGEN_INVOKED #ifdef BOOST_HISTOGRAM_DOXYGEN_INVOKED
@ -457,6 +462,12 @@ public:
#endif #endif
operator+=(const histogram<axes_type, S>& rhs) { operator+=(const histogram<axes_type, S>& rhs) {
const auto& raxes = unsafe_access::axes(rhs); const auto& raxes = unsafe_access::axes(rhs);
if (detail::axes_equal(axes_, unsafe_access::axes(rhs))) {
auto rit = unsafe_access::storage(rhs).begin();
for (auto&& x : storage_) x += *rit++;
return *this;
}
if (rank() != detail::axes_rank(raxes)) if (rank() != detail::axes_rank(raxes))
BOOST_THROW_EXCEPTION(std::invalid_argument("axes have different length")); BOOST_THROW_EXCEPTION(std::invalid_argument("axes have different length"));
auto h = histogram<axes_type, storage_type>( auto h = histogram<axes_type, storage_type>(
@ -691,8 +702,7 @@ histogram(Iterable)->histogram<std::vector<typename Iterable::value_type>>;
template <class Iterable, class S, class = detail::requires_iterable<Iterable>, template <class Iterable, class S, class = detail::requires_iterable<Iterable>,
class = detail::requires_any_axis<typename Iterable::value_type>, class = detail::requires_any_axis<typename Iterable::value_type>,
class = detail::requires_storage_or_adaptible<S>> class = detail::requires_storage_or_adaptible<S>>
histogram(Iterable, S) histogram(Iterable, S) -> histogram<
->histogram<
std::vector<typename Iterable::value_type>, std::vector<typename Iterable::value_type>,
std::conditional_t<detail::is_adaptible<S>::value, storage_adaptor<S>, S>>; std::conditional_t<detail::is_adaptible<S>::value, storage_adaptor<S>, S>>;