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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/eval/eval/tensor_function.h>
#include <vespa/vespalib/util/small_vector.h>
namespace vespalib::eval {
/**
* Tensor function for looking at the cell value of a dense tensor.
*/
class DenseTensorPeekFunction : public TensorFunction
{
private:
// first child is the tensor we want to peek
// other children are dimension index expressions
// (index expressions are sorted by normalized dimension order)
std::vector<Child> _children;
// index and size of all dimensions in reverse order
// when index is -1, use result of next child expression
// (note that child expression order is inverted by the stack)
SmallVector<std::pair<int64_t,size_t>> _spec;
public:
DenseTensorPeekFunction(std::vector<Child> children, SmallVector<std::pair<int64_t,size_t>> spec);
~DenseTensorPeekFunction() override;
const ValueType &result_type() const override { return DoubleValue::shared_type(); }
void push_children(std::vector<Child::CREF> &children) const override;
InterpretedFunction::Instruction compile_self(const CTFContext &ctx) const override;
bool result_is_mutable() const override { return true; }
static const TensorFunction &optimize(const TensorFunction &expr, Stash &stash);
};
} // namespace
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