math::iround

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/base/base_tests/math_test.cpp

@@ -209,4 +209,20 @@ UNIT_TEST(is_finite)
   TEST(is_finite(DBL_MIN / 2.0), ("As in cppreference example"));
 }
 
+UNIT_TEST(iround)
+{
+  TEST_EQUAL(iround(0.0), 0, ());
+  TEST_EQUAL(iround(1.0), 1, ());
+  TEST_EQUAL(iround(1.5), 2, ());
+  TEST_EQUAL(iround(-1.5), -2, ());
+  TEST_EQUAL(iround(2.5), 3, ());
+  TEST_EQUAL(iround(-2.5), -3, ());
+
+  TEST_EQUAL(iround(2.5f), 3, ());
+  TEST_EQUAL(iround(-2.5f), -3, ());
+
+  TEST_EQUAL(iround(double(std::numeric_limits<int>::max()) - 0.5), std::numeric_limits<int>::max(), ());
+  TEST_EQUAL(iround(double(std::numeric_limits<int>::min()) + 0.5), std::numeric_limits<int>::min(), ());
+}
+
 }  // namespace math_test

libs/base/math.hpp

@@ -1,9 +1,11 @@
 #pragma once
 
 #include "base/assert.hpp"
+#include "base/checked_cast.hpp"
 
 #include <algorithm>  // std::max
 #include <cmath>
+#include <concepts>
 #include <functional>  // std::hash
 #include <type_traits>
 
@@ -18,6 +20,12 @@ double Nan();
 double Infinity();
 bool is_finite(double d);
 
+template <std::floating_point T>
+int iround(T x)
+{
+  return base::checked_cast<int>(std::lround(x));
+}
+
 template <typename T>
 T Abs(T x)
 {

libs/drape_frontend/traffic_renderer.cpp

@@ -12,6 +12,7 @@
 #include "indexer/scales.hpp"
 
 #include "base/logging.hpp"
+#include "base/math.hpp"
 
 #include <algorithm>
 #include <array>
@@ -306,7 +307,7 @@ bool TrafficRenderer::CanBeRenderedAsLine(RoadClass const & roadClass, int zoomL
   if (it == lineDrawerEnd)
     return false;
 
-  width = std::max(1, static_cast<int>(std::lround(TrafficRenderer::GetPixelWidthInternal(roadClass, zoomLevel))));
+  width = std::max(1, math::iround(TrafficRenderer::GetPixelWidthInternal(roadClass, zoomLevel)));
   return width <= dp::SupportManager::Instance().GetMaxLineWidth();
 }
 }  // namespace df

libs/drape_frontend/visual_params.cpp

@@ -180,7 +180,7 @@ int GetTileScaleBase(m2::RectD const & r)
 {
   double const sz = std::max(r.SizeX(), r.SizeY());
   ASSERT_GREATER(sz, 0., ("Rect should not be a point:", r));
-  return std::max(1, static_cast<int>(std::lround(std::log2(mercator::Bounds::kRangeX / sz))));
+  return std::max(1, math::iround(std::log2(mercator::Bounds::kRangeX / sz)));
 }
 
 double GetTileScaleBase(double drawScale)
@@ -218,12 +218,12 @@ m2::RectD GetRectForDrawScale(int drawScale, m2::PointD const & center)
 
 m2::RectD GetRectForDrawScale(double drawScale, m2::PointD const & center, uint32_t tileSize, double visualScale)
 {
-  return GetRectForDrawScale(static_cast<int>(std::lround(drawScale)), center, tileSize, visualScale);
+  return GetRectForDrawScale(math::iround(drawScale), center, tileSize, visualScale);
 }
 
 m2::RectD GetRectForDrawScale(double drawScale, m2::PointD const & center)
 {
-  return GetRectForDrawScale(static_cast<int>(std::lround(drawScale)), center);
+  return GetRectForDrawScale(math::iround(drawScale), center);
 }
 
 uint32_t CalculateTileSize(uint32_t screenWidth, uint32_t screenHeight)

libs/ge0/url_generator.cpp

@@ -1,9 +1,9 @@
 #include "ge0/url_generator.hpp"
 
 #include "base/assert.hpp"
+#include "base/math.hpp"
 #include "coding/url.hpp"
 
-#include <cmath>
 #include <iomanip>
 #include <sstream>
 
@@ -158,7 +158,7 @@ int LatToInt(double lat, int maxValue)
   //       000111111222222...LLLLLMMMM
 
   double const x = (lat + 90.0) / 180.0 * maxValue;
-  return x < 0 ? 0 : (x > maxValue ? maxValue : static_cast<int>(std::lround(x)));
+  return x < 0 ? 0 : (x > maxValue ? maxValue : math::iround(x));
 }
 
 // Make lon in [-180, 180)

libs/geometry/geometry_tests/screen_test.cpp

@@ -1,12 +1,10 @@
 #include "geometry/geometry_tests/equality.hpp"
 
+#include "base/math.hpp"
 #include "geometry/screenbase.hpp"
 #include "geometry/transformations.hpp"
-
 #include "testing/testing.hpp"
 
-#include <cmath>
-
 namespace screen_test
 {
 using test::is_equal;
@@ -23,10 +21,10 @@ static void check_set_from_rect(ScreenBase & screen, int width, int height)
   b2 = screen.GtoP(b2);
 
   // check that we are in boundaries.
-  TEST(math::Between(0, width, static_cast<int>(std::lround(b1.x))), ());
+  TEST(math::Between(0, width, math::iround(b1.x)), ());
-  TEST(math::Between(0, width, static_cast<int>(std::lround(b2.x))), ());
+  TEST(math::Between(0, width, math::iround(b2.x)), ());
-  TEST(math::Between(0, height, static_cast<int>(std::lround(b1.y))), ());
+  TEST(math::Between(0, height, math::iround(b1.y)), ());
-  TEST(math::Between(0, height, static_cast<int>(std::lround(b2.y))), ());
+  TEST(math::Between(0, height, math::iround(b2.y)), ());
 }
 
 UNIT_TEST(ScreenBase_P2G2P)

libs/geometry/screenbase.cpp

@@ -3,8 +3,7 @@
 #include "geometry/transformations.hpp"
 
 #include "base/assert.hpp"
-
+#include "base/math.hpp"
-#include <cmath>
 
 double constexpr kPerspectiveAngleFOV = math::pi / 3.0;
 double constexpr kMaxPerspectiveAngle1 = math::pi4;
@@ -230,12 +229,12 @@ void ScreenBase::SetAngle(double angle)
 
 int ScreenBase::GetWidth() const
 {
-  return static_cast<int>(std::lround(m_PixelRect.SizeX()));
+  return math::iround(m_PixelRect.SizeX());
 }
 
 int ScreenBase::GetHeight() const
 {
-  return static_cast<int>(std::lround(m_PixelRect.SizeY()));
+  return math::iround(m_PixelRect.SizeY());
 }
 
 ScreenBase::MatrixT ScreenBase::CalcTransform(m2::PointD const & oldPt1, m2::PointD const & oldPt2,

libs/indexer/scales.cpp

@@ -1,10 +1,10 @@
 #include "indexer/scales.hpp"
 
+#include "base/math.hpp"
 #include "geometry/mercator.hpp"
 #include "indexer/feature_algo.hpp"
 
 #include <algorithm>
-#include <cmath>
 
 namespace scales
 {
@@ -33,12 +33,12 @@ double GetScaleLevelD(m2::RectD const & r)
 
 int GetScaleLevel(double ratio)
 {
-  return static_cast<int>(std::lround(GetScaleLevelD(ratio)));
+  return math::iround(GetScaleLevelD(ratio));
 }
 
 int GetScaleLevel(m2::RectD const & r)
 {
-  return static_cast<int>(std::lround(GetScaleLevelD(r)));
+  return math::iround(GetScaleLevelD(r));
 }
 
 namespace