#include <array>#include <cstdint>#include <iostream>#include <map>#include <stack>#include <stdexcept>#include <string_view> class BrainHackInterpreter{std::map<unsigned,unsigned> open_brackets, close_brackets;std::array<std::uint8_t,32768> data_{0};unsigned program_{0};int pos_{0}; void collect_brackets(conststd::string_view program){std::stack<unsigned> brackets_stack; for(auto pos{0U}; pos!= program.length();++pos){if(constchar c{program[pos]};'['== c)                brackets_stack.push(pos);elseif(']'== c){if(brackets_stack.empty())throwstd::runtime_error("Brackets [] do not match!");else{                    open_brackets[brackets_stack.top()]= pos;                    close_brackets[pos]= brackets_stack.top();                    brackets_stack.pop();}}} if(!brackets_stack.empty())throwstd::runtime_error("Brackets [] do not match!");} void check_data_pos(int pos){if(pos<0 orstatic_cast<int>(data_.size())<= pos)throwstd::out_of_range{"Data pointer out of bound!"};} public:    BrainHackInterpreter(conststd::string_view program){for(collect_brackets(program); program_< program.length();++program_)switch(program[program_]){case'<':                    check_data_pos(--pos_);break;case'>':                    check_data_pos(++pos_);break;case'-':--data_[pos_];break;case'+':++data_[pos_];break;case'.':std::cout<< data_[pos_];break;case',':std::cin>> data_[pos_];break;case'[':if(data_[pos_]==0)                        program_= open_brackets[program_];break;case']':if(data_[pos_]!=0)                        program_= close_brackets[program_];break;}}}; int main(){    BrainHackInterpreter{"++++++++[>++>>++>++++>++++<<<<<-]>[<+++>>+++<-]>[<+""+>>>+<<-]<[>+>+<<-]>>>--------.<<+++++++++.<<----.>"">>>>.<<<------.>..++.<++.+.-.>.<.>----.<--.++.>>>+."};std::cout<<'\n';}

Hi, cppreference!