Header-Only HPP File
This example creates a MATLAB® interface to a C++ library named
school. The library is
defined in a header file and does not have a compiled library file. A library defined
completely by its header file is called a header-only library.
This library defines classes representing students and teachers. After you publish this
library, MATLAB users can call functions in the
clib.school package to create
Teacher objects and specify names and
MATLAB provides the header file for you to use in this example in this folder:
To create an interface named
school for this library, follow these steps
in a workflow script: generate a library definition file, define any missing constructs, build
the interface, and then test the interface. If you need to iterate over the publishing
process, you can take additional steps to restore parameters and enable out-of-process
execution mode. You can then share your published interface with other users.
Create Workflow Script
Navigate to a writeable folder and call
clibPublishInterfaceWorkflow. In the dialog box, specify the name of
the workflow script, for example,
publishmatrixlib.mlx. The workflow
script has steps to help you publish the interface. Use the script to save the parameters
for publishing the interface. You can use the same script on all platforms.
The workflow script allows you to repeatedly generate, define, build, and test an interface during multiple MATLAB sessions. However, the script does not save edits to library definition files recreated using the Overwrite existing definition files option.
Step 1: GENERATE
First, generate the library definition file. The workflow script contains the Generate C++ Interface Live Editor task for this step. Use this task to select the files that make up the library and to set options for generating the library definition file.
The library is defined by the
school.hpp header file. Set
Library type to
To set the Library start path, browse to the folder
fullfile(matlabroot,"extern","examples","cpp_interface") and click
To select the header file, click Browse to open the file
The header file does not depend on other header files, so select the Library does not require include paths check box.
In this example, the C++ compiler is set to
By default, Name of interface library is
school. This name is used with
clib to call
functionality from MATLAB.
Verify that Output folder is a writeable folder.
Select the Overwrite existing definition files check box so that you can recreate the definition file while developing the interface.
Specify optional C++ library settings
Building the interface to this library does not require optional C++ library settings.
Specify optional definition configurations
Building the interface to this library does not require optional definition configurations.
By default, when you generate a definition file, the function displays available constructs (classes and functions in the library). While developing the interface, also select the Show unavailable constructs check box so that you can see what constructs might need more information in order to be included.
Generate Definition File
Click Generate definition file. The script displays its progress
and creates the library definition file
defineschool.m in the specified
Step 2: DEFINE
When you created the library definition file, MATLAB reported that one construct is partially defined. To completely define the
functionality, edit the
defineschool.m file. To edit the file, run the
Constructs with missing information are commented out. Scroll through the file to locate
the section titled "C++ function getName with MATLAB name clib.school.getName". Uncomment
the statements in the
getName code section.
The input argument
p is a scalar value. Replace
<SHAPE> in this statement with the number
defineArgument(getNameDefinition, "p", "clib.school.Person", "input", <SHAPE>);
defineArgument(getNameDefinition, "p", "clib.school.Person", "input", 1);
Save and close the definition file.
To validate the edits you made in the file, run the Confirm edits and run summary section. Fix any reported errors in the file.
summary function displays:
MATLAB Interface to school Library Class clib.school.Person Constructors: clib.school.Person() clib.school.Person(string,uint64) clib.school.Person(clib.school.Person) Methods: setName(string) setAge(uint64) string getName() uint64 getAge() No Properties defined Class clib.school.Teacher Constructors: clib.school.Teacher() clib.school.Teacher(string,uint64) clib.school.Teacher(clib.school.Teacher) Methods: string getName() No Properties defined Class clib.school.Student Constructors: clib.school.Student() clib.school.Student(string,uint64) clib.school.Student(clib.school.Student) Methods: string getName() No Properties defined Functions string clib.school.getName(clib.school.Person)
Step 3: BUILD
To build the
school interface to the library, run the
BUILD section of the script.
Building interface file 'schoolInterface.dll' for clib package 'school'. Interface file 'schoolInterface.dll' built in folder 'C:\Users\Documents\MATLAB\school'. To use the library, add the interface file folder to the MATLAB path. addpath('C:\Users\Documents\MATLAB\school')
You can repeat the generate, define, and build steps. However, once you display help
for or call functions in the library, you cannot update the
defineschool definition file in the same MATLAB session. Either restart MATLAB or create a new definition file by changing the Name of interface
library parameter in the Select configuration
Step 4: TEST
Set up and copy run-time libraries
Run the Set up and copy run-time libraries section. This library does not have additional run-time dependencies, so you do not need to modify the commands.
Call help on interface library
To display help for the interface library, run the Call help on interface library section.
Write code to call and test interface library
Use the code section in Write code to call and test interface library to write these tests:
t1 = clib.school.Teacher('Ms. Jones',24);
ans = "Ms. Jones"
To share the interface with another MATLAB user, create a toolbox installation (
.mltbx) file. Using
the instructions in Distribute MATLAB Interface to C++ Library:
Set the toolbox folder to your
schoolfolder, which contains the interface file
Identify the namespace (calling syntax) as