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| author | Mike Pall <mike> | 2012-06-20 15:15:09 +0200 |
|---|---|---|
| committer | Mike Pall <mike> | 2012-06-20 15:16:40 +0200 |
| commit | 6cee1333ef2b340e1b23e3051b9f433fc803d2ff (patch) | |
| tree | 43052260288c8208d2b049852242aaa2ad0f1e0c /doc/ext_ffi_semantics.html | |
| parent | 126f9906febcc90243a34191ab8986b9487cf186 (diff) | |
| download | luajit2-6cee1333ef2b340e1b23e3051b9f433fc803d2ff.tar.gz | |
FFI: Resolve metamethods for constructors, too.
Diffstat (limited to 'doc/ext_ffi_semantics.html')
| -rw-r--r-- | doc/ext_ffi_semantics.html | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/doc/ext_ffi_semantics.html b/doc/ext_ffi_semantics.html index bacb4fb8..4b498fbe 100644 --- a/doc/ext_ffi_semantics.html +++ b/doc/ext_ffi_semantics.html @@ -590,8 +590,7 @@ ffi.new("struct nested", {x=1,y={2,3}}) --> x = 1, y.a = 2, y.b = 3 <p> All of the standard Lua operators can be applied to cdata objects or a mix of a cdata object and another Lua object. The following list shows -the valid combinations. All other combinations currently raise an -error. +the pre-defined operations. </p> <p> Reference types are dereferenced <em>before</em> performing each of @@ -600,7 +599,8 @@ C type pointed to by the reference. </p> <p> The pre-defined operations are always tried first before deferring to a -metamethod for a ctype (if defined). +metamethod or index table (if any) for the corresponding ctype. An error +is raised if the metamethod lookup or index table lookup fails. </p> <h3 id="cdata_array">Indexing a cdata object</h3> @@ -625,7 +625,9 @@ field value and <a href="#convert_tolua">converts it to a Lua object</a>. A write access <a href="#convert_fromlua">converts a Lua object to the field type</a> and stores the converted value to the field. An error is raised if a write access to a constant -<tt>struct</tt>/<tt>union</tt> or a constant field is attempted.</li> +<tt>struct</tt>/<tt>union</tt> or a constant field is attempted. +Scoped enum constants or static constants are treated like a constant +field.</li> <li><b>Indexing a complex number</b>: a complex number can be indexed either by a cdata number or a Lua number with the values 0 or 1, or by @@ -644,6 +646,12 @@ assigning to an index of a vector raises an error.</li> </ul> <p> +A ctype object can be indexed with a string key, too. The only +pre-defined operation is reading scoped constants of +<tt>struct</tt>/<tt>union</tt> types. All other accesses defer +to the corresponding metamethods or index tables (if any). +</p> +<p> Note: since there's (deliberately) no address-of operator, a cdata object holding a value type is effectively immutable after initialization. The JIT compiler benefits from this fact when applying |