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<title>c_vec - Rust</title>
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<p class='location'>Crate c_vec</p><div class="block items"><ul><li><a href="#structs">Structs</a></li></ul></div><p class='location'></p><script>window.sidebarCurrent = {name: 'c_vec', ty: 'mod', relpath: '../'};</script>
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<h1 class='fqn'><span class='in-band'>Crate <a class="mod" href=''>c_vec</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a class='srclink' href='../src/c_vec/c_vec.rs.html#10-397' title='goto source code'>[src]</a></span></h1>
<div class='docblock'><p>Library to interface with chunks of memory allocated in C.</p>
<p>It is often desirable to safely interface with memory allocated from C,
encapsulating the unsafety into allocation and destruction time. Indeed,
allocating memory externally is currently the only way to give Rust shared
mut state with C programs that keep their own references; vectors are
unsuitable because they could be reallocated or moved at any time, and
importing C memory into a vector takes a one-time snapshot of the memory.</p>
<p>This module simplifies the usage of such external blocks of memory. Memory
is encapsulated into an opaque object after creation; the lifecycle of the
memory can be optionally managed by Rust, if an appropriate destructor
closure is provided. Safety is ensured by bounds-checking accesses, which
are marshalled through get and set functions.</p>
<p>There are three unsafe functions: the two constructors, and the
unwrapping method. The constructors are unsafe for the
obvious reason (they act on a pointer that cannot be checked inside the
method), but <code>into_inner()</code> is somewhat more subtle in its unsafety.
It returns the contained pointer, but at the same time destroys the CVec
without running its destructor. This can be used to pass memory back to
C, but care must be taken that the ownership of underlying resources are
handled correctly, i.e. that allocated memory is eventually freed
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</div><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
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<td><a class="struct" href="struct.CSlice.html"
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<td class='docblock-short'>
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<p>The type representing an &#39;unsafe&#39; foreign chunk of memory</p>
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<td><a class="struct" href="struct.CVec.html"
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<td class='docblock-short'>
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<p>The type representing a foreign chunk of memory</p>
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