wrapped2d 0.3.1

Rust binding for Box2D
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
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179

macro_rules! _from_ffi {
    { $wrap:ident <= $wrapped:ty } => {
        impl FromFFI<$wrapped> for $wrap {
            unsafe fn from_ffi(ptr: *mut $wrapped) -> $wrap {
                assert!(!ptr.is_null());
                $wrap {
                    ptr: ptr,
                }
            }
        }
    }
}

macro_rules! wrap {
    { $wrapped:ty => custom $wrap:ident } => {
        impl Wrapped<$wrapped> for $wrap {
            unsafe fn ptr(&self) -> *const $wrapped {
                self.ptr as *const $wrapped
            }

            unsafe fn mut_ptr(&mut self) -> *mut $wrapped {
                self.ptr
            }
        }
    };

    { $wrapped:ty => $(#[$attr:meta])* pub $wrap:ident } => {
        $(#[$attr])*
        pub struct $wrap {
            ptr: *mut $wrapped,
        }

        wrap! { $wrapped => custom $wrap }
        _from_ffi! { $wrap <= $wrapped }
    };

    { $wrapped:ty => $(#[$attr:meta])* $wrap:ident } => {
        $(#[$attr])*
        struct $wrap {
            ptr: *mut $wrapped,
        }

        wrap! { $wrapped => custom $wrap }
        _from_ffi! { $wrap <= $wrapped }
    };

    {
        base $base:ty => custom $wrap:ident
        < $as_base:path
    } => {
        impl WrappedBase<$base> for $wrap {
            unsafe fn base_ptr(&self) -> *const $base {
                $as_base(self.ptr) as *const $base
            }

            unsafe fn mut_base_ptr(&mut self) -> *mut $base {
                $as_base(self.ptr)
            }
        }
    };

    {
        $base:ty: $wrapped:ty => custom $wrap:ident
        < $as_base:path
        > $base_as:path
    } => {
        wrap! { $wrapped => custom $wrap }
        wrap! {
            base $base => custom $wrap
            < $as_base
        }
    };

    {
        $base:ty: $wrapped:ty => pub $wrap:ident
        < $as_base:path
        > $base_as:path
    } => {
        wrap! { $wrapped => pub $wrap }
        wrap! {
            base $base => custom $wrap
            < $as_base
        }

        impl FromFFI<$base> for $wrap {
            unsafe fn from_ffi(ptr: *mut $base) -> $wrap {
                assert!(!ptr.is_null());
                $wrap {
                    ptr: $base_as(ptr),
                }
            }
        }
    };
}

use std::mem;
use std::marker::PhantomData;
use std::ops::{Deref, DerefMut};

#[doc(hidden)]
pub trait Wrapped<T> {
    unsafe fn ptr(&self) -> *const T;
    unsafe fn mut_ptr(&mut self) -> *mut T;
}

#[doc(hidden)]
pub trait WrappedBase<B> {
    unsafe fn base_ptr(&self) -> *const B;
    unsafe fn mut_base_ptr(&mut self) -> *mut B;
}

#[doc(hidden)]
pub trait FromFFI<T> {
    unsafe fn from_ffi(ptr: *mut T) -> Self where Self: Sized;
}

pub struct WrappedRefMut<'a, T> {
    object: Option<T>,
    phantom: PhantomData<&'a ()>,
}

impl<'a, T> WrappedRefMut<'a, T> {
    #[doc(hidden)]
    pub unsafe fn new(t: T) -> WrappedRefMut<'a, T> {
        WrappedRefMut {
            object: Some(t),
            phantom: PhantomData,
        }
    }
}

impl<'a, T> Deref for WrappedRefMut<'a, T> {
    type Target = T;

    fn deref<'b>(&'b self) -> &'b T {
        self.object.as_ref().unwrap()
    }
}

impl<'a, T> DerefMut for WrappedRefMut<'a, T> {
    fn deref_mut<'b>(&'b mut self) -> &'b mut T {
        self.object.as_mut().unwrap()
    }
}

impl<'a, T> Drop for WrappedRefMut<'a, T> {
    fn drop(&mut self) {
        mem::forget(self.object.take())
    }
}

pub struct WrappedRef<'a, T> {
    object: Option<T>,
    phantom: PhantomData<&'a ()>,
}

impl<'a, T> WrappedRef<'a, T> {
    #[doc(hidden)]
    pub unsafe fn new(t: T) -> WrappedRef<'a, T> {
        WrappedRef {
            object: Some(t),
            phantom: PhantomData,
        }
    }
}

impl<'a, T> Deref for WrappedRef<'a, T> {
    type Target = T;

    fn deref<'b>(&'b self) -> &'b T {
        self.object.as_ref().unwrap()
    }
}

impl<'a, T> Drop for WrappedRef<'a, T> {
    fn drop(&mut self) {
        mem::forget(self.object.take())
    }
}