Compute Library
 21.02
LutAccessor.h
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24 #ifndef ARM_COMPUTE_TEST_NEON_LUTACCESSOR_H
25 #define ARM_COMPUTE_TEST_NEON_LUTACCESSOR_H
26 
27 #include "tests/ILutAccessor.h"
28 
30 
31 namespace arm_compute
32 {
33 namespace test
34 {
35 /** Accessor implementation for @ref Lut objects. */
36 template <typename T>
37 class LutAccessor : public ILutAccessor<T>
38 {
39 public:
40  /** Create an accessor for the given @p Lut.
41  */
43  : _lut{ lut }
44  {
45  }
46 
47  /** Prevent instances of this class from being copy constructed */
48  LutAccessor(const LutAccessor &) = delete;
49  /** Prevent instances of this class from being copied */
50  LutAccessor &operator=(const LutAccessor &) = delete;
51  /** Allow instances of this class to be move constructed */
52  LutAccessor(LutAccessor &&) = default;
53  /** Allow instances of this class to be moved */
54  LutAccessor &operator=(LutAccessor &&) = default;
55 
56  int num_elements() const override
57  {
58  return _lut.num_elements();
59  }
60 
61  const T &operator[](T input_value) const override
62  {
63  auto lut = reinterpret_cast<T *>(_lut.buffer());
64  int32_t real_index = _lut.index_offset() + static_cast<int32_t>(input_value);
65 
66  if(0 <= real_index && real_index < num_elements())
67  {
68  return lut[real_index];
69  }
70  ARM_COMPUTE_ERROR("Error index not in range.");
71  }
72 
73  T &operator[](T input_value) override
74  {
75  auto lut = reinterpret_cast<T *>(_lut.buffer());
76  int32_t real_index = _lut.index_offset() + static_cast<int32_t>(input_value);
77 
78  if(0 <= real_index && real_index < num_elements())
79  {
80  return lut[real_index];
81  }
82  ARM_COMPUTE_ERROR("Error index not in range.");
83  }
84 
85 private:
86  ILut &_lut;
87 };
88 } // namespace test
89 } // namespace arm_compute
90 #endif /* ARM_COMPUTE_TEST_NEON_LUTACCESSOR_H */
const T & operator[](T input_value) const override
Read access to the specified element.
Definition: LutAccessor.h:61
#define ARM_COMPUTE_ERROR(msg)
Print the given message then throw an std::runtime_error.
Definition: Error.h:352
int num_elements() const override
Number of elements of the Lut.
Definition: LutAccessor.h:56
virtual size_t num_elements() const =0
Returns the total number of elements in the LUT.
Basic implementation of the LUT interface.
Definition: Lut.h:39
Copyright (c) 2017-2021 Arm Limited.
Accessor implementation for Lut objects.
Definition: LutAccessor.h:37
Lookup Table object interface.
Definition: ILut.h:34
virtual uint32_t index_offset() const =0
Indicates the offset that needs to be applied to the raw index before performing a lookup in the LUT...
LutAccessor(Lut &lut)
Create an accessor for the given Lut.
Definition: LutAccessor.h:42
virtual uint8_t * buffer() const =0
Returns a pointer to the start of the LUT.
LutAccessor & operator=(const LutAccessor &)=delete
Prevent instances of this class from being copied.
T & operator[](T input_value) override
Write access to the specified element.
Definition: LutAccessor.h:73
Common interface to provide information and access to Lut like structures.
Definition: ILutAccessor.h:38