This library could be used to run a Brainfuck program at compile time using user-defined string literal operator templates (gcc/clang extension) or a simple function.
Simple hello world.
constexpr auto hello_world = "++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++."_bf;
// hello_world has std::array<char, N> type.
std::cout << std::string(hello_world.begin(), hello_world.end()) << std::endl;Reverse input.
constexpr auto reversed = "+[>,]+[<.-]"_bfi << "fbppc";A branfuck interpreter that takes a brainfuck program as input. http://www.hevanet.com/cristofd/brainfuck/dbfi.b
constexpr auto bf_in_bf = bf<1000, 5>(
">>>+[[-]>>[-]++>+>+++++++[<++++>>++<-]++>>+>+>+++++[>++>++++++<<-]+>>>,<++[[>["
"->>]<[>>]<<-]<[<]<+>>[>]>[<+>-[[<+>-]>]<[[[-]<]++<-[<+++++++++>[<->-]>>]>>]]<<"
"]<]<[[<]>[[>]>>[>>]+[<<]<[<]<+>>-]>[>]+[->>]<<<<[[<<]<[<]+<<[+>+<<-[>-->+<<-[>"
"+<[>>+<<-]]]>[<+>-]<]++>>-->[>]>>[>>]]<<[>>+<[[<]<]>[[<<]<[<]+[-<+>>-[<<+>++>-"
"[<->[<<+>>-]]]<[>+<-]>]>[>]>]>[>>]>>]<<[>>+>>+>>]<<[->>>>>>>>]<<[>.>>>>>>>]<<["
">->>>>>]<<[>,>>>]<<[>+>]<<[+<<]<]",
"+[>,]+[<.-]!abc");