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util-src/table.c @ 10973:39991e40d1dc
util.dbuffer: dynamic string buffer
Similar to util.ringbuffer (and shares almost identical API). Differences:
- size limit is optional and dynamic
- does not allocate a fixed buffer of max_size bytes
- focus on simply storing references to existing string objects where possible,
avoiding unnecessary allocations
- references are still stored in a ring buffer to enable use as a fast FIFO
Optional second parameter to new() provides the number of ring buffer segments. On
Lua 5.2 on my laptop, a segment is ~19 bytes. If the ring buffer fills up, the next
write will compact all strings into a single item.
author | Matthew Wild <mwild1@gmail.com> |
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date | Fri, 26 Jun 2020 16:41:31 +0100 |
parent | 7969:1c6a07606309 |
child | 12402:8deb401a21f6 |
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line source
#include <lua.h> #include <lauxlib.h> static int Lcreate_table(lua_State *L) { lua_createtable(L, luaL_checkinteger(L, 1), luaL_checkinteger(L, 2)); return 1; } static int Lpack(lua_State *L) { unsigned int n_args = lua_gettop(L); lua_createtable(L, n_args, 1); lua_insert(L, 1); for(int arg = n_args; arg >= 1; arg--) { lua_rawseti(L, 1, arg); } lua_pushinteger(L, n_args); lua_setfield(L, -2, "n"); return 1; } int luaopen_util_table(lua_State *L) { #if (LUA_VERSION_NUM > 501) luaL_checkversion(L); #endif lua_createtable(L, 0, 2); lua_pushcfunction(L, Lcreate_table); lua_setfield(L, -2, "create"); lua_pushcfunction(L, Lpack); lua_setfield(L, -2, "pack"); return 1; }