[cmake-commits] david.cole committed CMakeLists.txt NONE 1.1 MakeTable.cxx NONE 1.1 MathFunctions.h NONE 1.1 mysqrt.cxx NONE 1.1

[cmake-commits at cmake.org]

Update of /cvsroot/CMake/CMake/Tests/Tutorial/Step6/MathFunctions
In directory public:/mounts/ram/cvs-serv25735/Tutorial/Step6/MathFunctions

Added Files:
	CMakeLists.txt MakeTable.cxx MathFunctions.h mysqrt.cxx 
Log Message:
ENH: Add new Tutorial steps. Diff between Step5 and Step6 shows how to add a cpack driven installer to your project. Diff between Step6 and Step7 shows how to add ctest dashboard scripting capability.


--- NEW FILE: MathFunctions.h ---
double mysqrt(double x);

--- NEW FILE: mysqrt.cxx ---
#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;
}

--- NEW FILE: CMakeLists.txt ---
# first we add the executable that generates the table
add_executable(MakeTable MakeTable.cxx)

get_target_property(MakeTableLocation MakeTable LOCATION)

# add the command to generate the source code
add_custom_command (
  OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h
  DEPENDS MakeTable
  COMMAND ${MakeTableLocation}
  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)

--- NEW FILE: MakeTable.cxx ---
// 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 table of 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;
}