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[lua52-sys] add ref/unref functions and helper constants 

These are useful when adding things to the Lua registry. From the
documentation at http://pgl.yoyo.org/luai/i/luaL_ref:

> As long as you do not manually add integer keys into table t, luaL_ref
> ensures the uniqueness of the key it returns.

This can be done by hand with (say) an `AtomicIsize`, but it's just
easier to use these functions.
master
Siddharth Agarwal 2017-08-25 19:52:39 -07:00
parent 42992f1448
commit ed51538105
1 changed files with 5 additions and 0 deletions
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5
lua52-sys/src/lib.rs
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@ -53,6 +53,9 @@ pub const LUA_MINSTACK: c_int = 20;
pub const LUA_RIDX_MAINTHREAD: c_int = 1;
pub const LUA_RIDX_GLOBALS: c_int = 2;
pub const LUA_REFNIL: c_int = -1;
pub const LUA_NOREF: c_int = -2;
pub type lua_Number = libc::c_double;
pub type lua_Integer = libc::ptrdiff_t;
pub type lua_Unsigned = libc::c_ulong;
@ -224,6 +227,8 @@ extern "C" {
pub fn lua_gethookcount(L: *mut lua_State) -> c_int;
pub fn luaL_openlibs(L: *mut lua_State);
pub fn luaL_ref(L: *mut lua_State, idx: c_int) -> c_int;
pub fn luaL_unref(L: *mut lua_State, idx: c_int, ref_id: c_int);
pub fn luaopen_base(L: *mut lua_State);
pub fn luaopen_bit32(L: *mut lua_State);