Add a geospatial extension #20
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A UML diagram depicting the relationships between the different types in the example.
A key point is that bmi_geo_heat "has a" bmi_heat, and the relationship only goes one way, with the extension being able to access the core BMI but not the other way around. |
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My Fortran is rusty, so I welcome any suggestions for improvement to the code in this PR. |
This matchesthe change in 77407c8. [ci skip]
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This pull request explores how a BMI extension could work in Fortran. It's modeled on @mcflugen's csdms/bmi-example-python#31, with some differences based on the language and the choices I made.
Like the Fortran specification for the core BMI functions, the geospatial BMI extension resides in a separate repository: https://github.com/mdpiper/bmi-geospatial-fortran. The code there defines an abstract type, bmi_geo, that is intended to be overridden by a concrete type in an implementation.
This PR implements bmi_geo through the type bmi_geo_heat. A key feature of a bmi_geo_heat type is that it has a reference to the bmi_heat type that implements the core BMI functions for the heat model.
I included an example program, bmi_geospatial_ex, that demostrates how to call both the core BMI functions and the extension functions for the heat model.