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Using the CLASS program is convenient in a development phase for
testing, or for small projects, but in a production phase it may be
better to use a program linked to the CLASS library with the
dedicated Fortran API. The main advantages of this API is 1) that it
does not use the SIC interpreted language (compiled code is faster)
and 2) that it does not start the whole CLASS program mechanisms
(e.g. command logging, graphic support, etc).
A demonstration program is presented in the
Appendix
. This program does the same as the demo-telwrite.class procedure. Note that all subroutines using the
Fortran API must use the module class_api. It provides
CLASS types, parameters, and procedure interfaces. Here is a
summary of the subroutines provided by the API:
- class_write_init: initialize the libclass for writing
process,
- class_write_clean: clean the libclass after writing
process,
- class_fileout_open: initialize/reopen a Class output
file,
- class_fileout_close: close the Class output file,
- class_obs_init: initialize an observation
variable,
- class_obs_reset: zero-ify and resize an observation,
- class_obs_write: write an observation to the output
file,
- class_obs_clean: clean/free an observation
variable.
The detailed API is available in the appendix
. It
is the responsiblity of the calling program to instantiate a type(observation) variable and to pass them to the related
subroutines. There is no global buffers or variables involved here, on
purpose.
Subsections
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Up: IRAM Memo 2014-1 CLASS
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2023-06-01