The author of CBLAS chose to implement a Fortran intermediate subroutine sdsdotsub. However, you probably could call the sdsdot function (in whichever language it is actually implemented) directly from C cblas_sdsdot. The very common reference implementation is written in Fortran, but it is not the fastest one. The functionality is in whatever BLAS implementation you install. Therefore the CBLAS does not actually contain the whole functionality. BLAS can be implemented in C or assembly, but the API is set to be Fortran. BLAS is defined using a reference Fortran implementation and a Fortran API. 'What I wanna ask is actually why there is a need for a intermediate wrapper, why not write it in C?' (More detailed in this question)Īn example could be as below, with the usage of 'object-closing' context manager from PEP 343 examples, and a wrapper class with close method which calls native object's destructor: with statement (from PEP 343) on the other hand guarantees that if _enter_ method of the object succeeded, then _exit_ method will be called at the end of the statement, both in case of normal execution and in case of exception. So even if in most cases _del_ method of an object is being called by GC, it is not guaranteed. The try…finally statement and the with statement provide convenient ways to do this. Programs are strongly recommended to explicitly close such objects. It is understood that these resources are freed when the object is garbage-collected, but since garbage collection is not guaranteed to happen, such objects also provide an explicit way to release the external resource, usually a close() method. Some objects contain references to “external” resources such as open files or windows. An implementation is allowed to postpone garbage collection or omit it altogether. Objects are never explicitly destroyed however, when they become unreachable they may be garbage-collected.

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