git subrepo clone --branch=20.41.6 git@github.com:ETLCPP/etl.git components/etl

subrepo:
  subdir:   "components/etl"
  merged:   "be5537ec"
upstream:
  origin:   "git@github.com:ETLCPP/etl.git"
  branch:   "20.41.6"
  commit:   "be5537ec"
git-subrepo:
  version:  "0.4.9"
  origin:   "???"
  commit:   "???"

components/etl/test/test_quantize.cpp

@@ -0,0 +1,123 @@
+/******************************************************************************
+The MIT License(MIT)
+
+Embedded Template Library.
+https://github.com/ETLCPP/etl
+https://www.etlcpp.com
+
+Copyright(c) 2021 John Wellbelove
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files(the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions :
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+******************************************************************************/
+
+#include "unit_test_framework.h"
+
+#include "etl/quantize.h"
+
+#include <array>
+#include <algorithm>
+#include <math.h>
+
+namespace
+{
+  constexpr size_t Size        = 20UL;
+  constexpr size_t NThresholds = 4UL;
+
+  using IntQuantize     = etl::quantize<int>;
+  using DoubleQuantize  = etl::quantize<double>;
+
+  struct Compare
+  {
+    bool operator ()(double lhs, double rhs) const
+    {
+      return fabs(lhs - rhs) < 0.1;
+    }
+  };
+
+  //***********************************
+  const std::array<int, NThresholds> thresholds1 =
+  {
+    14, 18, 22, 25
+  };
+
+  const std::array<int, NThresholds + 1> quantizations1 =
+  {
+    1, 2, 3, 4, 5
+  };
+
+  const std::array<int, Size> input1 =
+  {
+    10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29
+  };
+
+  const std::array<int, Size> result1a =
+  {
+    1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 5, 5, 5, 5
+  };
+
+  std::array<int, Size> output1;
+
+  //***********************************
+  const std::array<double, NThresholds> thresholds2 =
+  {
+    14.0, 18.0, 22.0, 25.0
+  };
+
+  const std::array<double, NThresholds + 1> quantizations2 =
+  {
+    1.0, 2.0, 3.0, 4.0, 5.0
+  };
+
+  const std::array<double, Size> input2 =
+  {
+    10.0, 11.0, 12.0, 13.0, 14.0, 15.0, 16.0, 17.0, 18.0, 19.0, 20.0, 21.0, 22.0, 23.0, 24.0, 25.0, 26.0, 27.0, 28.0, 29.0
+  };
+
+  const std::array<double, Size> result2a =
+  {
+    1.0, 1.0, 1.0, 1.0, 2.0, 2.0, 2.0, 2.0, 3.0, 3.0, 3.0, 3.0, 4.0, 4.0, 4.0, 5.0, 5.0, 5.0, 5.0, 5.0
+  };
+
+  std::array<double, Size> output2;
+
+  SUITE(test_quantize)
+  {
+    //*************************************************************************
+    TEST(test_int_quantize)
+    {
+      IntQuantize quantize(thresholds1.data(), quantizations1.data(), quantizations1.size());
+
+      std::transform(input1.begin(), input1.end(), output1.begin(), quantize );
+
+      bool isEqual = std::equal(output1.begin(), output1.end(), result1a.begin());
+      CHECK(isEqual);
+    }
+
+    //*************************************************************************
+    TEST(test_double_quantize)
+    {
+      DoubleQuantize quantize(thresholds2.data(), quantizations2.data(), quantizations2.size());
+
+      std::transform(input2.begin(), input2.end(), output2.begin(), quantize );
+
+      bool isEqual = std::equal(output2.begin(), output2.end(), result2a.begin(), Compare());
+      CHECK(isEqual);
+    }
+  };
+}