int64 result is error

[openresty]

int64 result is error

[vanc]

Actually, you don't need to use the ffi function directly. LuaJIT does the boxing/unboxing automatically. Just need to tell it's a long number by appending the "ll" modifer.

a=9223372036854775807ll
b=9223372036854775806ll
=a-b
1LL

[nt47]

how to increase size to 32 simbols?

[nt47]

hello? creators ? little bird needs you

[AlexKordic]

Maybe use BigNum library? Like this one https://github.com/user-none/lua-nums ?

Really strange to post textual question using image. Distasteful.

[vanc]

You can use ffi to workaround big integer issue. It should be easier than using a big number library.

ffi=require'ffi'
a=ffi.new('uint64_t', 9223372036854775807ull)
=a
9223372036854775807ULL
b=ffi.new('uint64_t', 9223372036854775806ull)
=b
9223372036854775806ULL
c=a-b
=c
1ULL
d=c
=d
1ULL
=tonumber(d)
1

[nt47]

Actually, you don't need to use the ffi function directly. LuaJIT does the boxing/unboxing automatically. Just need to tell it's a long number by appending the "ll" modifer.

a=9223372036854775807ll
b=9223372036854775806ll
=a-b
1LL

no, this way is not good,i just want to use int64 without ll, and can use tostring,can u tell me how to compile luajit for int64 ?

[vanc]

i just want to use int64 without ll

Unfortunately, you cannot do that. Lua can only store 64-bit integers up to 2^53. With LuaJIT, it automatically boxes 64-bit values in CDATA object when it detects the "ll" or "ull" modifiers.

can u tell me how to compile luajit for int64 ?

Don't understand your question. There is no special compile options for int64. Just use the standard source code and compile for your platform.

[nt47]

i just want to use int64 without ll

Unfortunately, you cannot do that. Lua can only store 64-bit integers up to 2^53. With LuaJIT, it automatically boxes 64-bit values in CDATA object when it detects the "ll" or "ull" modifiers.

can u tell me how to compile luajit for int64 ?

Don't understand your question. There is no special compile options for int64. Just use the standard source code and compile for your platform.

omg,i don't want to use C# to wrapper my API...

can luajit2's developer can do it ?