pyo3 0.4.0

Bindings to Python interpreter
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97

// Copyright (c) 2017-present PyO3 Project and Contributors
//
// based on Daniel Grunwald's https://github.com/dgrunwald/rust-cpython

use std::os::raw::c_double;

use conversion::{IntoPyObject, ToPyObject};
use err::PyErr;
use ffi;
use instance::{Py, PyObjectWithToken};
use object::PyObject;
use objectprotocol::ObjectProtocol;
use python::{Python, ToPyPointer};

/// Represents a Python `float` object.
///
/// You can usually avoid directly working with this type
/// by using [`ToPyObject`](trait.ToPyObject.html)
/// and [extract](struct.PyObject.html#method.extract)
/// with `f32`/`f64`.
#[repr(transparent)]
pub struct PyFloat(PyObject);

pyobject_native_type!(PyFloat, ffi::PyFloat_Type, ffi::PyFloat_Check);

impl PyFloat {
    /// Creates a new Python `float` object.
    pub fn new(_py: Python, val: c_double) -> Py<PyFloat> {
        unsafe { Py::from_owned_ptr_or_panic(ffi::PyFloat_FromDouble(val)) }
    }

    /// Gets the value of this float.
    pub fn value(&self) -> c_double {
        unsafe { ffi::PyFloat_AsDouble(self.0.as_ptr()) }
    }
}

impl ToPyObject for f64 {
    fn to_object(&self, py: Python) -> PyObject {
        PyFloat::new(py, *self).into()
    }
}
impl IntoPyObject for f64 {
    fn into_object(self, py: Python) -> PyObject {
        PyFloat::new(py, self).into()
    }
}

pyobject_extract!(obj to f64 => {
    let v = unsafe { ffi::PyFloat_AsDouble(obj.as_ptr()) };

    {
        if v == -1.0 && PyErr::occurred(obj.py()) {
            Err(PyErr::fetch(obj.py()))
        } else {
            Ok(v)
        }
    }
});

impl ToPyObject for f32 {
    fn to_object(&self, py: Python) -> PyObject {
        PyFloat::new(py, *self as f64).into()
    }
}
impl IntoPyObject for f32 {
    fn into_object(self, py: Python) -> PyObject {
        PyFloat::new(py, self as f64).into()
    }
}

pyobject_extract!(obj to f32 => {
    Ok(obj.extract::<f64>()? as f32)
});

#[cfg(test)]
mod test {
    use conversion::ToPyObject;
    use python::Python;

    macro_rules! num_to_py_object_and_back (
        ($func_name:ident, $t1:ty, $t2:ty) => (
            #[test]
            fn $func_name() {
                let gil = Python::acquire_gil();
                let py = gil.python();
                let val = 123 as $t1;
                let obj = val.to_object(py);
                assert_eq!(obj.extract::<$t2>(py).unwrap(), val as $t2);
            }
        )
    );

    num_to_py_object_and_back!(to_from_f64, f64, f64);
    num_to_py_object_and_back!(to_from_f32, f32, f32);
    num_to_py_object_and_back!(int_to_float, i32, f64);
}