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From af2e5c8b1bf17a0a0e1c1492735395bdd49ffd65 Mon Sep 17 00:00:00 2001
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From: Mattias Ellert <mattias.ellert@physics.uu.se>
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Date: Mon, 29 Jun 2020 12:57:43 +0200
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Subject: [PATCH] Fix off-by-one error in the histogram v7 bin iterator
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The histogram bin iterator should start at 1 and end at N + 1, not
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start at 0 and end at N. (As for all iterators, the end element is the
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invalid element after the last one.)
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Fixes an assertion in the histhistv7testUnit test
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[----------] 2 tests from BinIterNBins
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[ RUN ] BinIterNBins.NumBins
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/usr/include/c++/10/bits/stl_vector.h:1045: std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::operator[](std::vector<_Tp, _Alloc>::size_type) [with _Tp = float; _Alloc = std::allocator<float>; std::vector<_Tp, _Alloc>::reference = float&; std::vector<_Tp, _Alloc>::size_type = long unsigned int]: Assertion '__builtin_expect(__n < this->size(), true)' failed.
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---
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hist/histv7/inc/ROOT/RHist.hxx | 4 ++--
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hist/histv7/test/biniter.cxx | 2 +-
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2 files changed, 3 insertions(+), 3 deletions(-)
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diff --git a/hist/histv7/inc/ROOT/RHist.hxx b/hist/histv7/inc/ROOT/RHist.hxx
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index ebb319f1ef..9521fe182f 100644
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--- a/hist/histv7/inc/ROOT/RHist.hxx
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+++ b/hist/histv7/inc/ROOT/RHist.hxx
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@@ -158,9 +158,9 @@ public:
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/// Get the uncertainty on the content of the bin at `x`.
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double GetBinUncertainty(const CoordArray_t &x) const { return fImpl->GetBinUncertainty(x); }
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- const_iterator begin() const { return const_iterator(*fImpl); }
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+ const_iterator begin() const { return const_iterator(*fImpl, 1); }
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- const_iterator end() const { return const_iterator(*fImpl, fImpl->GetNBinsNoOver()); }
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+ const_iterator end() const { return const_iterator(*fImpl, fImpl->GetNBinsNoOver() + 1); }
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/// Swap *this and other.
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///
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diff --git a/hist/histv7/test/biniter.cxx b/hist/histv7/test/biniter.cxx
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index aa1c2dfef9..1f940aa8e7 100644
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--- a/hist/histv7/test/biniter.cxx
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+++ b/hist/histv7/test/biniter.cxx
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@@ -45,7 +45,7 @@ TEST(BinIterNBins, BinRef) {
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double founduncert = -1.;
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RH2F::CoordArray_t foundcoord{};
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- int nBins = 0;
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+ int nBins = 1;
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for (auto bin: h) {
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auto binCenter = bin.GetCenter();
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if (std::fabs(binCenter[0] - x) < 0.1 && std::fabs(binCenter[1] - y) < 0.1) {
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--
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2.26.2
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