Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
246 views
in Technique[技术] by (71.8m points)

python - Is there any type for function in Cython?

Is there any way to tell Cython compiler that param is function. Something like

  cpdef float calc_class_re(list data, func callback)
See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

Should be self-explanatory..? :)

# Define a new type for a function-type that accepts an integer and
# a string, returning an integer.
ctypedef int (*f_type)(int, str)

# Extern a function of that type from foo.h
cdef extern from "foo.h":
    int do_this(int, str)

# Passing this function will not work.
cpdef int do_that(int a, str b):
    return 0

# However, this will work.
cdef int do_stuff(int a, str b):
    return 0

# This functio uses a function of that type. Note that it cannot be a
# cpdef function because the function-type is not available from Python.
cdef void foo(f_type f):
    print f(0, "bar")

# Works:
foo(do_this)   # the externed function
foo(do_stuff)  # the cdef function

# Error:
# Cannot assign type 'int (int, str, int __pyx_skip_dispatch)' to 'f_type'
foo(do_that)   # the cpdef function

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...