lua_KContext typedef ... lua_KContext; The type for continuation-function contexts. It must be a numeric type. This type is defined as intptr_t when intptr_t is available, so that it can store pointers too. Otherwise, it is defined as ptrdiff_t.

lua_isyieldable[-0, +0, –] int lua_isyieldable (lua_State *L); Returns 1 if the given coroutine can yield, and 0 otherwise.

lua_isuserdata[-0, +0, –] int lua_isuserdata (lua_State *L, int index); Returns 1 if the value at the given index is a userdata (either full or light), and 0 otherwise.

lua_isthread[-0, +0, –] int lua_isthread (lua_State *L, int index); Returns 1 if the value at the given index is a thread, and 0 otherwise.

lua_istable[-0, +0, –] int lua_istable (lua_State *L, int index); Returns 1 if the value at the given index is a table, and 0 otherwise.

lua_isstring[-0, +0, –] int lua_isstring (lua_State *L, int index); Returns 1 if the value at the given index is a string or a number (which is always convertible to a string), and 0 otherwise.

lua_isnumber[-0, +0, –] int lua_isnumber (lua_State *L, int index); Returns 1 if the value at the given index is a number or a string convertible to a number, and 0 otherwise.

lua_isnoneornil[-0, +0, –] int lua_isnoneornil (lua_State *L, int index); Returns 1 if the given index is not valid or if the value at this index is nil, and 0 otherwise.

lua_isnone[-0, +0, –] int lua_isnone (lua_State *L, int index); Returns 1 if the given index is not valid, and 0 otherwise.

lua_isnil[-0, +0, –] int lua_isnil (lua_State *L, int index); Returns 1 if the value at the given index is nil, and 0 otherwise.