ENH: step 5

Tests/Tutorial/Step5/CMakeLists.txt

@@ -0,0 +1,70 @@
+project (Tutorial)
+
+# The version number.
+set (Tutorial_VERSION_MAJOR 1)
+set (Tutorial_VERSION_MINOR 0)
+
+# does this system provide the log and exp functions?
+include (${CMAKE_ROOT}/Modules/CheckFunctionExists.cmake)
+check_function_exists (log HAVE_LOG)
+check_function_exists (exp HAVE_EXP)
+
+# configure a header file to pass some of the CMake settings
+# to the source code
+configure_file (
+  "${PROJECT_SOURCE_DIR}/TutorialConfig.h.in"
+  "${PROJECT_BINARY_DIR}/TutorialConfig.h"
+  )
+
+# should we use our own math functions
+option(USE_MYMATH "Use tutorial provided math implementation" ON)
+
+# add the binary tree to the search path for include files
+# so that we will find TutorialConfig.h
+include_directories ("${PROJECT_BINARY_DIR}")
+
+# add the MathFunctions library?
+if (USE_MYMATH)
+  include_directories ("${PROJECT_SOURCE_DIR}/MathFunctions")
+  add_subdirectory (MathFunctions)
+  set (EXTRA_LIBS ${EXTRA_LIBS} MathFunctions)
+endif (USE_MYMATH)
+
+# add the executable
+add_executable (Tutorial tutorial.cxx)
+target_link_libraries (Tutorial  ${EXTRA_LIBS})
+
+# add the install targets
+install_targets (/bin Tutorial)
+install_files (/include FILES "${PROJECT_BINARY_DIR}/TutorialConfig.h")
+
+# enable testing
+enable_testing ()
+
+# does the application run
+add_test (TutorialRuns Tutorial 25)
+
+# does the usage message work?
+add_test (TutorialUsage Tutorial)
+set_tests_properties (TutorialUsage
+  PROPERTIES 
+  PASS_REGULAR_EXPRESSION "Usage:.*number"
+  )
+
+#define a macro to simplify adding tests
+macro (do_test arg result)
+  add_test (TutorialComp${arg} Tutorial ${arg})
+  set_tests_properties (TutorialComp${arg}
+    PROPERTIES PASS_REGULAR_EXPRESSION ${result}
+    )
+endmacro (do_test)
+
+# do a bunch of result based tests
+do_test (4 "4 is 2")
+do_test (9 "9 is 3")
+do_test (5 "5 is 2.236")
+do_test (7 "7 is 2.645")
+do_test (25 "25 is 5")
+do_test (-25 "-25 is 0")
+do_test (0.0001 "0.0001 is 0.01")
+

Tests/Tutorial/Step5/MathFunctions/CMakeLists.txt

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+# first we add the exetuable that generates the table
+add_executable(MakeTable MakeTable.cxx)
+
+# add the command to generate the source code
+add_custom_command (
+  OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h
+  DEPENDS MakeTable
+  COMMAND MakeTable
+  ARGS ${CMAKE_CURRENT_BINARY_DIR}/Table.h
+  )
+
+set_source_files_properties (
+  mysqrt.cxx PROPERTIES 
+  OBJECT_DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/Table.h
+  )
+
+# add the binary tree directory to the search path for include files
+include_directories( ${CMAKE_CURRENT_BINARY_DIR} )
+
+# add the main library
+add_library(MathFunctions mysqrt.cxx)
+
+install_targets (/bin MathFunctions)
+install_files (/include FILES MathFunctions.h)

Tests/Tutorial/Step5/MathFunctions/MakeTable.cxx

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+// A simple program that builds a sqrt table 
+#include <stdio.h>
+#include <math.h>
+
+int main (int argc, char *argv[])
+{
+  int i;
+  double result;
+
+  // make sure we have enough arguments
+  if (argc < 2)
+    {
+    return 1;
+    }
+  
+  // open the output file
+  FILE *fout = fopen(argv[1],"w");
+  if (!fout)
+    {
+    return 1;
+    }
+  
+  // crate a source file with a tabel fo square roots
+  fprintf(fout,"double sqrtTable[] = {\n");
+  for (i = 0; i < 10; ++i)
+    {
+    result = sqrt(static_cast<double>(i));
+    fprintf(fout,"%g,\n",result);
+    }
+
+  // close the table with a zero
+  fprintf(fout,"0};\n");
+  fclose(fout);
+  return 0;
+}

Tests/Tutorial/Step5/MathFunctions/MathFunctions.h

@@ -0,0 +1 @@
+double mysqrt(double x);

Tests/Tutorial/Step5/MathFunctions/mysqrt.cxx

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+#include <stdio.h>
+#include "MathFunctions.h"
+#include "TutorialConfig.h"
+
+// include the generated table
+#include "Table.h"
+
+#include <math.h>
+
+// a hack square root calculation using simple operations
+double mysqrt(double x)
+{
+  if (x <= 0)
+    {
+    return 0;
+    }
+  
+  double result;
+
+  // if we have both log and exp then use them
+  double delta;  
+
+  // use the table to help find an initial value
+  result = x;
+  if (x >= 1 && x < 10)
+    {
+    result = sqrtTable[static_cast<int>(x)];
+    }
+
+  // do ten iterations
+  int i;
+  for (i = 0; i < 10; ++i)
+    {
+    if (result <= 0)
+      {
+      result = 0.1;
+      }
+    delta = x - (result*result);
+    result = result + 0.5*delta/result;
+    fprintf(stdout,"Computing sqrt of %g to be %g\n",x,result);
+    }
+
+  return result;
+}

Tests/Tutorial/Step5/TutorialConfig.h.in

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+// the configured options and settings for Tutorial
+#define Tutorial_VERSION_MAJOR @Tutorial_VERSION_MAJOR@
+#define Tutorial_VERSION_MINOR @Tutorial_VERSION_MINOR@
+#cmakedefine USE_MYMATH
+
+// does the platform provide exp and log functions?
+#cmakedefine HAVE_LOG
+#cmakedefine HAVE_EXP
+

Tests/Tutorial/Step5/tutorial.cxx

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+// A simple program that computes the square root of a number
+#include <stdio.h>
+#include <math.h>
+#include "TutorialConfig.h"
+
+#ifdef USE_MYMATH
+#include "MathFunctions.h"
+#endif
+
+int main (int argc, char *argv[])
+{
+  if (argc < 2)
+    {
+    fprintf(stdout,"%s Version %d.%d\n",
+            argv[0],
+            Tutorial_VERSION_MAJOR,
+            Tutorial_VERSION_MINOR);
+    fprintf(stdout,"Usage: %s number\n",argv[0]);
+    return 1;
+    }
+
+  double inputValue = atof(argv[1]);
+
+#ifdef USE_MYMATH
+  double outputValue = mysqrt(inputValue);
+#else
+  double outputValue = sqrt(inputValue);
+#endif
+
+  fprintf(stdout,"The square root of %g is %g\n",
+          inputValue, outputValue);
+  return 0;
+}