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Signature files give you a way of making function and value definitions private to a module. You ve already seen the syntax for the definition of a signature file in 2. A signature file can be generated using the compiler s i switch. Any definitions that appear in a signature file are public, and anyone can access them using the module. Any definitions that are not in the signature file are private and can be used only inside the module itself. The typical way to create a signature file is to generate it from the module source, and then go through and erase any values and functions that you want to be private. The signature file name must be the same as the name of the module with which it is paired. It must have the extension .fsi or .mli, and you must specify the signature file to the compiler. On the command line, you must give it directly before the source file for its module. In Visual Studio, the signature file must appear before the source file in Solution Explorer. For example, assume you have the following in the file Lib.fs:

CHAPTER 11 LIGHTS, CAMERA, ACTION!

Note NMock is a tool developed by a group of ThoughWorks developers that includes Joe Walnes, Chris

// define a function to be exposed let funkyFunction x = x + ": keep it funky!" // define a function that will be hidden let notSoFunkyFunction x = x + 1 Now assume you want to create a library that exposes funkyFunction but not notSoFunkyFunction. You would use the signature code like this and save it as Lib.fsi: // expose a function val funkyFunction: string -> string Next, you would use the command line like this: fsc -a Lib.fsi Lib.fs

glTexCoord2f(0, 0) glVertex3f(-300, -300, 0) glEnd() pygame.display.flip() # Delete the texture when we are finished with it glDeleteTextures(texture_id) if __name__ == "__main__": run() The run function performs the five steps required to read in the sushitex.png image and upload the image data to OpenGL. It then draws a textured quad by sending OpenGL four texture coordinates and four vertices. Texture coordinates are sent with the glTexcoord2f function, which takes the s and t components as parameters. An alternative to glTexcoord2f is the glTexCoord2fv function, which takes a sequence (tuple, Vector2, etc.) rather than individual values. The rotation is done with the glRotate function, which creates a rotation matrix about an axis and multiplies it by the current model-view matrix. It takes four parameters: the first parameter is the angle you want to rotate by (in degrees), followed by the x, y, and z component of the axis. For example, a call to glRotate(45, 1, 0, 0) would rotate 45 degrees around the x axis, and a call to glRotate(-30, 0, 1, 0) would rotate negative 30 degrees (i.e., 30 degrees clockwise) around the y axis. You can also use this function to rotate around any axis, and not just the three basic axes. When you run Listing 11-2, you will see something like Figure 11-2, with a large textured quad rotating around the x axis. Try experimenting with the texture coordinate values to see the effect they have on the quad.

This gives you an assembly named Lib.dll with one class named Lib, one public function named funkyFunction, and one private function named notSoFunkyFunction.

Stevenson, Owen Rogers, Nat Pryce, and Steve Freeman. For more information about NMock, visit http://nmock.truemesh.com/index.html and http://confluence.public.thoughtworks.org/ display/NMock/Home.

F# supports another way of controlling the visibility of a value or type You can use the private or internal keywords directly after the let of a let binding to make it private or internal, as the following example demonstrates: let private aPrivateBinding = "Keep this private" let internal aInternalBinding = "Keep this internal" The private keyword makes the value or type visible only within the current module, and the internal keyword makes the value or type visible only within the current assembly The private and internal keywords have roughly the same meaning as the private and internal keywords in C# The internal keyword is particularly useful to make types that are specific to F# invisible outside the assembly, while allowing them to be shared between modules within the assembly.

CHAPTER 11 LIGHTS, CAMERA, ACTION!