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Change format_descriptor::value to a static func

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This commit is contained in:
Ivan Smirnov 2016-06-19 14:39:41 +01:00
parent a7e62e1ca6
commit 42ad328481
5 changed files with 35 additions and 27 deletions
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16
docs/advanced.rst
View File

@ -1224,12 +1224,12 @@ completely avoid copy operations with Python expressions like
py::class_<Matrix>(m, "Matrix")
.def_buffer([](Matrix &m) -> py::buffer_info {
return py::buffer_info(
m.data(), /* Pointer to buffer */
sizeof(float), /* Size of one scalar */
py::format_descriptor<float>::value, /* Python struct-style format descriptor */
2, /* Number of dimensions */
{ m.rows(), m.cols() }, /* Buffer dimensions */
{ sizeof(float) * m.rows(), /* Strides (in bytes) for each index */
m.data(), /* Pointer to buffer */
sizeof(float), /* Size of one scalar */
py::format_descriptor<float>::value(), /* Python struct-style format descriptor */
2, /* Number of dimensions */
{ m.rows(), m.cols() }, /* Buffer dimensions */
{ sizeof(float) * m.rows(), /* Strides (in bytes) for each index */
sizeof(float) }
);
});
@ -1273,7 +1273,7 @@ buffer objects (e.g. a NumPy matrix).
py::buffer_info info = b.request();
/* Some sanity checks ... */
if (info.format != py::format_descriptor<Scalar>::value)
if (info.format != py::format_descriptor<Scalar>::value())
throw std::runtime_error("Incompatible format: expected a double array!");
if (info.ndim != 2)
@ -1299,7 +1299,7 @@ as follows:
m.data(), /* Pointer to buffer */
sizeof(Scalar), /* Size of one scalar */
/* Python struct-style format descriptor */
py::format_descriptor<Scalar>::value,
py::format_descriptor<Scalar>::value(),
/* Number of dimensions */
2,
/* Buffer dimensions */

14
example/example-buffers.cpp
View File

@ -81,7 +81,7 @@ void init_ex_buffers(py::module &m) {
/// Construct from a buffer
.def("__init__", [](Matrix &v, py::buffer b) {
py::buffer_info info = b.request();
if (info.format != py::format_descriptor<float>::value || info.ndim != 2)
if (info.format != py::format_descriptor<float>::value() || info.ndim != 2)
throw std::runtime_error("Incompatible buffer format!");
new (&v) Matrix(info.shape[0], info.shape[1]);
memcpy(v.data(), info.ptr, sizeof(float) * v.rows() * v.cols());
@ -104,12 +104,12 @@ void init_ex_buffers(py::module &m) {
/// Provide buffer access
.def_buffer([](Matrix &m) -> py::buffer_info {
return py::buffer_info(
m.data(), /* Pointer to buffer */
sizeof(float), /* Size of one scalar */
py::format_descriptor<float>::value, /* Python struct-style format descriptor */
2, /* Number of dimensions */
{ m.rows(), m.cols() }, /* Buffer dimensions */
{ sizeof(float) * m.rows(), /* Strides (in bytes) for each index */
m.data(), /* Pointer to buffer */
sizeof(float), /* Size of one scalar */
py::format_descriptor<float>::value(), /* Python struct-style format descriptor */
2, /* Number of dimensions */
{ m.rows(), m.cols() }, /* Buffer dimensions */
{ sizeof(float) * m.rows(), /* Strides (in bytes) for each index */
sizeof(float) }
);
})

18
include/pybind11/common.h
View File

@ -204,7 +204,7 @@ struct buffer_info {
void *ptr; // Pointer to the underlying storage
size_t itemsize; // Size of individual items in bytes
size_t size; // Total number of entries
std::string format; // For homogeneous buffers, this should be set to format_descriptor<T>::value
std::string format; // For homogeneous buffers, this should be set to format_descriptor<T>::value()
size_t ndim; // Number of dimensions
std::vector<size_t> shape; // Shape of the tensor (1 entry per dimension)
std::vector<size_t> strides; // Number of entries between adjacent entries (for each per dimension)
@ -348,14 +348,22 @@ PYBIND11_RUNTIME_EXCEPTION(reference_cast_error) /// Used internally
[[noreturn]] PYBIND11_NOINLINE inline void pybind11_fail(const std::string &reason) { throw std::runtime_error(reason); }
/// Format strings for basic number types
#define PYBIND11_DECL_FMT(t, v) template<> struct format_descriptor<t> { static constexpr const char *value = v; }
#define PYBIND11_DECL_FMT(t, v) template<> struct format_descriptor<t> \
{ static constexpr const char* value() { return v; } };
template <typename T, typename SFINAE = void> struct format_descriptor { };
template <typename T> struct format_descriptor<T, typename std::enable_if<std::is_integral<T>::value>::type> {
static constexpr const char value[2] =
static constexpr const char* value() { return format; }
static constexpr const char format[2] =
{ "bBhHiIqQ"[detail::log2(sizeof(T))*2 + (std::is_unsigned<T>::value ? 1 : 0)], '\0' };
};
template <typename T> constexpr const char format_descriptor<
T, typename std::enable_if<std::is_integral<T>::value>::type>::value[2];
PYBIND11_DECL_FMT(float, "f"); PYBIND11_DECL_FMT(double, "d"); PYBIND11_DECL_FMT(bool, "?");
T, typename std::enable_if<std::is_integral<T>::value>::type>::format[2];
PYBIND11_DECL_FMT(float, "f");
PYBIND11_DECL_FMT(double, "d");
PYBIND11_DECL_FMT(bool, "?");
NAMESPACE_END(pybind11)

12
include/pybind11/eigen.h
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@ -133,7 +133,7 @@ struct type_caster<Type, typename std::enable_if<is_eigen_dense<Type>::value &&
/* Size of one scalar */
sizeof(Scalar),
/* Python struct-style format descriptor */
format_descriptor<Scalar>::value,
format_descriptor<Scalar>::value(),
/* Number of dimensions */
1,
/* Buffer dimensions */
@ -148,7 +148,7 @@ struct type_caster<Type, typename std::enable_if<is_eigen_dense<Type>::value &&
/* Size of one scalar */
sizeof(Scalar),
/* Python struct-style format descriptor */
format_descriptor<Scalar>::value,
format_descriptor<Scalar>::value(),
/* Number of dimensions */
isVector ? 1 : 2,
/* Buffer dimensions */
@ -233,7 +233,7 @@ struct type_caster<Type, typename std::enable_if<is_eigen_sparse<Type>::value>::
try {
obj = matrix_type(obj);
} catch (const error_already_set &) {
PyErr_Clear();
PyErr_Clear();
return false;
}
}
@ -276,7 +276,7 @@ struct type_caster<Type, typename std::enable_if<is_eigen_sparse<Type>::value>::
// Size of one scalar
sizeof(Scalar),
// Python struct-style format descriptor
format_descriptor<Scalar>::value,
format_descriptor<Scalar>::value(),
// Number of dimensions
1,
// Buffer dimensions
@ -291,7 +291,7 @@ struct type_caster<Type, typename std::enable_if<is_eigen_sparse<Type>::value>::
// Size of one scalar
sizeof(StorageIndex),
// Python struct-style format descriptor
format_descriptor<StorageIndex>::value,
format_descriptor<StorageIndex>::value(),
// Number of dimensions
1,
// Buffer dimensions
@ -306,7 +306,7 @@ struct type_caster<Type, typename std::enable_if<is_eigen_sparse<Type>::value>::
// Size of one scalar
sizeof(StorageIndex),
// Python struct-style format descriptor
format_descriptor<StorageIndex>::value,
format_descriptor<StorageIndex>::value(),
// Number of dimensions
1,
// Buffer dimensions

2
include/pybind11/numpy.h
View File

@ -351,7 +351,7 @@ struct vectorize_helper {
return cast(f(*((Args *) buffers[Index].ptr)...));
array result(buffer_info(nullptr, sizeof(Return),
format_descriptor<Return>::value,
format_descriptor<Return>::value(),
ndim, shape, strides));
buffer_info buf = result.request();