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Implement host span. #5459

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Merged
merged 1 commit into from
Apr 3, 2020
Merged

Implement host span. #5459

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3 changes: 3 additions & 0 deletions include/xgboost/host_device_vector.h
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Original file line number Diff line number Diff line change
Expand Up @@ -105,6 +105,9 @@ class HostDeviceVector {
const T* DevicePointer() const { return ConstDevicePointer(); }

T* HostPointer() { return HostVector().data(); }
common::Span<T> HostSpan() { return common::Span<T>{HostVector()}; }
common::Span<T const> HostSpan() const { return common::Span<T const>{HostVector()}; }
common::Span<T const> ConstHostSpan() const { return HostSpan(); }
const T* ConstHostPointer() const { return ConstHostVector().data(); }
const T* HostPointer() const { return ConstHostPointer(); }

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9 changes: 9 additions & 0 deletions tests/cpp/common/test_host_device_vector.cu
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Expand Up @@ -165,6 +165,15 @@ TEST(HostDeviceVector, Span) {
auto const_span = vec.ConstDeviceSpan();
ASSERT_EQ(vec.Size(), const_span.size());
ASSERT_EQ(vec.ConstDevicePointer(), const_span.data());

auto h_span = vec.ConstHostSpan();
ASSERT_TRUE(vec.HostCanRead());
ASSERT_FALSE(vec.HostCanWrite());
ASSERT_EQ(h_span.size(), vec.Size());
ASSERT_EQ(h_span.data(), vec.ConstHostPointer());

h_span = vec.HostSpan();
ASSERT_TRUE(vec.HostCanWrite());
}

TEST(HostDeviceVector, MGPU_Basic) {
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