da_clCreateContextFromType

Undocumented in source but is binding to an external library. You might be able to learn more by searching the web for its name.
extern (System)
alias da_clCreateContextFromType = cl_context function(const(cl_context_properties*), cl_device_type, void function(const(char*), const(void*), size_t, void*), void*, cl_int*)

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