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-rw-r--r--docs/examples/userguide/buffer/matrix_with_buffer.pyx93
1 files changed, 48 insertions, 45 deletions
diff --git a/docs/examples/userguide/buffer/matrix_with_buffer.pyx b/docs/examples/userguide/buffer/matrix_with_buffer.pyx
index 985991cbe..fc2c160f3 100644
--- a/docs/examples/userguide/buffer/matrix_with_buffer.pyx
+++ b/docs/examples/userguide/buffer/matrix_with_buffer.pyx
@@ -1,45 +1,48 @@
-# distutils: language = c++
-
-from cpython cimport Py_buffer
-from libcpp.vector cimport vector
-
-cdef class Matrix:
- cdef Py_ssize_t ncols
- cdef Py_ssize_t shape[2]
- cdef Py_ssize_t strides[2]
- cdef vector[float] v
-
- def __cinit__(self, Py_ssize_t ncols):
- self.ncols = ncols
-
- def add_row(self):
- """Adds a row, initially zero-filled."""
- self.v.resize(self.v.size() + self.ncols)
-
- def __getbuffer__(self, Py_buffer *buffer, int flags):
- cdef Py_ssize_t itemsize = sizeof(self.v[0])
-
- self.shape[0] = self.v.size() / self.ncols
- self.shape[1] = self.ncols
-
- # Stride 1 is the distance, in bytes, between two items in a row;
- # this is the distance between two adjacent items in the vector.
- # Stride 0 is the distance between the first elements of adjacent rows.
- self.strides[1] = <Py_ssize_t>( <char *>&(self.v[1])
- - <char *>&(self.v[0]))
- self.strides[0] = self.ncols * self.strides[1]
-
- buffer.buf = <char *>&(self.v[0])
- buffer.format = 'f' # float
- buffer.internal = NULL # see References
- buffer.itemsize = itemsize
- buffer.len = self.v.size() * itemsize # product(shape) * itemsize
- buffer.ndim = 2
- buffer.obj = self
- buffer.readonly = 0
- buffer.shape = self.shape
- buffer.strides = self.strides
- buffer.suboffsets = NULL # for pointer arrays only
-
- def __releasebuffer__(self, Py_buffer *buffer):
- pass
+# distutils: language = c++
+from cpython cimport Py_buffer
+from libcpp.vector cimport vector
+
+
+cdef class Matrix:
+ cdef Py_ssize_t ncols
+ cdef Py_ssize_t[2] shape
+ cdef Py_ssize_t[2] strides
+ cdef vector[float] v
+
+ def __cinit__(self, Py_ssize_t ncols):
+ self.ncols = ncols
+
+ def add_row(self):
+ """Adds a row, initially zero-filled."""
+ self.v.resize(self.v.size() + self.ncols)
+
+ def __getbuffer__(self, Py_buffer *buffer, int flags):
+ cdef Py_ssize_t itemsize = sizeof(self.v[0])
+
+ self.shape[0] = self.v.size() // self.ncols
+ self.shape[1] = self.ncols
+
+ # Stride 1 is the distance, in bytes, between two items in a row;
+ # this is the distance between two adjacent items in the vector.
+ # Stride 0 is the distance between the first elements of adjacent rows.
+ self.strides[1] = <Py_ssize_t>( <char *>&(self.v[1])
+ - <char *>&(self.v[0]))
+
+
+
+ self.strides[0] = self.ncols * self.strides[1]
+
+ buffer.buf = <char *>&(self.v[0])
+ buffer.format = 'f' # float
+ buffer.internal = NULL # see References
+ buffer.itemsize = itemsize
+ buffer.len = self.v.size() * itemsize # product(shape) * itemsize
+ buffer.ndim = 2
+ buffer.obj = self
+ buffer.readonly = 0
+ buffer.shape = self.shape
+ buffer.strides = self.strides
+ buffer.suboffsets = NULL # for pointer arrays only
+
+ def __releasebuffer__(self, Py_buffer *buffer):
+ pass