Got googletest working in sim/tests

CMakeLists.txt

@@ -6,8 +6,19 @@ project(
     LANGUAGES CXX)
 
 if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
+    include_directories(${PROJECT_SOURCE_DIR}/src)
     set(CMAKE_CXX_EXTENSIONS OFF)
-    set(CMAKE_CXX_STANDARD 17)
+    set(CMAKE_CXX_STANDARD 20)
+
+    # Need to set specific options for specific compilers here.
+    if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+      # No special flags yet
+    elseif(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+    # No special flags yet
+
+    elseif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+      # Not sure... Anyone that uses MSVC can help here
+    endif()
 
     set_property(GLOBAL PROPERTY USE_FOLDERS ON)
 
@@ -25,6 +36,7 @@ enable_testing()
 
 add_subdirectory(src/gui)
 add_subdirectory(src/sim)
-add_subdirectory(src/Utils)
-add_subdirectory(src/Utils/math)
+add_subdirectory(src/sim/tests)
+add_subdirectory(src/utils)
+add_subdirectory(src/utils/math)
 add_subdirectory(src/model)

src/Utils/CMakeLists.txt

@@ -1,6 +0,0 @@
-find_package(CURL)
-
-add_library(utils
-   CurlConnection.cpp)
-
-target_link_libraries(utils curl jsoncpp ssl crypto) 

src/Utils/math/CMakeLists.txt

@@ -1,3 +0,0 @@
-add_library(math
-   Constants.cpp)
-

src/sim/CMakeLists.txt

@@ -4,4 +4,4 @@ add_library(sim
    WindModel.cpp
    USStandardAtmosphere.cpp)
 
-target_include_directories(sim PRIVATE ${PROJECT_SOURCE_DIR}/src)
+target_link_libraries(sim PRIVATE math)

src/sim/USStandardAtmosphere.cpp

@@ -1,6 +1,9 @@
 #include "USStandardAtmosphere.h"
 
-#include "Utils/math/Constants.h"
+#include "utils/math/Constants.h"
+#include <cmath>
+
+using namespace utils::math;
 
 namespace sim
 {
@@ -15,5 +18,17 @@ USStandardAtmosphere::~USStandardAtmosphere()
 
 }
 
+double USStandardAtmosphere::getDensity(double altitude)
+{
+   return Constants::standardDensity * std::exp((-Constants::g0 * Constants::airMolarMass * altitude) / (Constants::Rstar * Constants::standardTemperature));
+}
 
+double USStandardAtmosphere::getTemperature(double altitude)
+{
+   return 0.0;
+}
+double USStandardAtmosphere::getPressure(double altitude)
+{
+   return 0.0;
+}
 } // namespace sim

src/sim/USStandardAtmosphere.h

@@ -2,6 +2,7 @@
 #define SIM_USSTANDARDATMOSPHERE_H
 
 #include "AtmosphericModel.h"
+#include "utils/BinMap.h"
 
 namespace sim
 {
@@ -12,6 +13,12 @@ public:
    USStandardAtmosphere();
    virtual ~USStandardAtmosphere();
 
+   /**
+    * @brief Get the density of the air at a given altitude above mean sea level
+    * 
+    * @param altitude the altitude above sea level
+    * @return the density in kg/m^3
+    */
    double getDensity(double altitude) override;
    double getPressure(double altitude) override;
    double getTemperature(double altitude) override;

src/sim/tests/CMakeLists.txt

@@ -0,0 +1,19 @@
+include(FetchContent)
+
+FetchContent_Declare(
+  googletest
+  GIT_REPOSITORY https://github.com/google/googletest.git
+  GIT_TAG release-1.11.0
+)
+
+FetchContent_MakeAvailable(googletest)
+add_library(GTest::GTest INTERFACE IMPORTED)
+target_link_libraries(GTest::GTest INTERFACE gtest_main)
+
+add_executable(usstandardatmosphere_test USStandardAtmosphereTests.cpp)
+target_link_libraries(usstandardatmosphere_test
+   PRIVATE
+   GTest::GTest
+   sim)
+
+add_test(sim_tests usstandardatmosphere_test)

src/sim/tests/USStandardAtmosphereTests.cpp

@@ -0,0 +1,26 @@
+#include "../USStandardAtmosphere.h"
+#include <gtest/gtest.h>
+
+#include <iostream>
+
+TEST(USStandardAtmosphereTests, DensityTests)
+{
+   sim::USStandardAtmosphere atm;
+   double seaLevelDensity = 1.2250;
+   double testDensity = atm.getDensity(0.0);
+   ASSERT_EQ(seaLevelDensity, testDensity);
+
+   // Test some other values
+   for(int i = 1; i <= 10; ++i)
+   {
+      double altitude = 1000.0 * i;
+      std::cout << altitude << ": " << atm.getDensity(altitude) << std::endl;
+   }
+
+}
+
+int main(int argc, char** argv)
+{
+   ::testing::InitGoogleTest(&argc, argv);
+   return RUN_ALL_TESTS();
+}

src/utils/BinMap.cpp

@@ -0,0 +1,62 @@
+#include "BinMap.h"
+
+#include <algorithm>
+
+#include <stdexcept>
+#include <sstream>
+
+#include <fmt/core.h>
+
+// TODO: Check on the availability of this in Clang.
+// Replace libfmt with format when LLVM libc++ supports it
+//#include <format>
+
+namespace utils
+{
+
+BinMap::BinMap()
+{
+
+}
+
+BinMap::~BinMap()
+{
+
+}
+
+void BinMap::insert(std::pair<double, double>& toInsert)
+{
+   bins.push_back(toInsert);
+   std::sort(bins.begin(), bins.end(),
+      [](const auto& a, const auto& b){ return a.first < b.first; });
+}
+
+double BinMap::operator[](double key)
+{
+   auto iter = bins.begin();
+   // If the key is less than the lowest bin value, then it is out of range
+   // This should be an error. It's also possible to interpret this as simply
+   // the lowest bin, but I think that invites a logic error so we'll throw
+   // instead
+   if(key < iter->first)
+   {
+      throw std::out_of_range(
+         fmt::format("{} less than lower bound {} of BinMap", key, iter->first));
+   }
+   // Increment it and start searching If we reach the end without finding an existing key
+   // greater than our search term, then we've just hit the last bin and return that
+   iter++;
+   double retVal = bins.end()->second;
+   while(iter !=  bins.end())
+   {
+      if(key < iter->first)
+      {
+         retVal = std::prev(iter)->second;
+         break;
+      }
+      iter++;
+   }
+   return retVal;
+}
+
+} // namespace utils

src/utils/BinMap.h

@@ -0,0 +1,25 @@
+#ifndef UTILS_MATH_BINMAP_H
+#define UTILS_MATH_BINMAP_H
+
+#include <vector>
+#include <utility>
+
+namespace utils
+{
+class BinMap
+{
+public:
+   BinMap();
+   ~BinMap();
+
+   void insert(std::pair<double, double>& toInsert);
+   double operator[](double key);
+
+private:
+   std::vector<std::pair<double, double>> bins;
+
+};
+
+} // namespace utils
+
+#endif // UTILS_MATH_BINMAP_H

src/utils/CMakeLists.txt

@@ -0,0 +1,9 @@
+find_package(CURL)
+find_package(fmt)
+
+add_library(utils
+   BinMap.cpp
+   CurlConnection.cpp)
+
+# Also including the header-only fmt library
+target_link_libraries(utils PRIVATE curl jsoncpp ssl crypto fmt::fmt-header-only) 

src/utils/math/CMakeLists.txt

@@ -0,0 +1,2 @@
+add_library(math
+   Constants.cpp)

src/utils/math/Constants.h

@@ -10,6 +10,7 @@ namespace Constants
    constexpr const double g0 = 9.80665;
    constexpr const double airMolarMass = 0.0289644;
    constexpr const double standardTemperature = 288.15;
+   constexpr const double standardDensity = 1.2250;
 };
 
 } // namespace utils::math