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[ADT] Wrapper for std::accumulate accepting a range. #158702

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Merged
merged 1 commit into from
Sep 16, 2025
Merged

[ADT] Wrapper for std::accumulate accepting a range. #158702

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7 changes: 7 additions & 0 deletions llvm/include/llvm/ADT/STLExtras.h
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,7 @@
#include <iterator>
#include <limits>
#include <memory>
#include <numeric>
#include <optional>
#include <tuple>
#include <type_traits>
Expand Down Expand Up @@ -1694,6 +1695,12 @@ template <typename R> constexpr size_t range_size(R &&Range) {
return static_cast<size_t>(std::distance(adl_begin(Range), adl_end(Range)));
}

/// Wrapper for std::accumulate.
template <typename R, typename E> auto accumulate(R &&Range, E &&Init) {
return std::accumulate(adl_begin(Range), adl_end(Range),
std::forward<E>(Init));
}

/// Provide wrappers to std::for_each which take ranges instead of having to
/// pass begin/end explicitly.
template <typename R, typename UnaryFunction>
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10 changes: 10 additions & 0 deletions llvm/unittests/ADT/STLExtrasTest.cpp
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Expand Up @@ -1602,6 +1602,16 @@ TEST(STLExtrasTest, Fill) {
EXPECT_THAT(V2, ElementsAre(Val, Val, Val, Val));
}

TEST(STLExtrasTest, Accumulate) {
EXPECT_EQ(accumulate(std::vector<int>(), 0), 0);
EXPECT_EQ(accumulate(std::vector<int>(), 3), 3);
std::vector<int> V1 = {1, 2, 3, 4, 5};
EXPECT_EQ(accumulate(V1, 0), std::accumulate(V1.begin(), V1.end(), 0));
EXPECT_EQ(accumulate(V1, 10), std::accumulate(V1.begin(), V1.end(), 10));
EXPECT_EQ(accumulate(drop_begin(V1), 7),
std::accumulate(V1.begin() + 1, V1.end(), 7));
}

struct Foo;
struct Bar {};

Expand Down