1 // A bare-bones llvm::Optional reimplementation. 2 3 template <typename T> struct MyOptionalStorage { 4 MyOptionalStorage(T val) : value(val), hasVal(true) {} 5 MyOptionalStorage() {} 6 T value; 7 bool hasVal = false; 8 }; 9 10 template <typename T> struct MyOptional { 11 MyOptionalStorage<T> Storage; 12 MyOptional(T val) : Storage(val) {} 13 MyOptional() {} 14 T &operator*() { return Storage.value; } 15 }; 16 17 void stop() {} 18 19 int main(int argc, char **argv) { 20 MyOptional<int> x, y = 42; 21 stop(); // break here 22 return *y; 23 } 24 25 // Produced from the assembler in 26 // Shell/ScriptInterpreter/Python/Inputs/FormatterBytecode/formatter.py 27 __attribute__((used, section("__DATA_CONST,__lldbformatters"))) unsigned char 28 _MyOptional_type_summary[] = 29 "\x01" // version 30 "\xa4" // record size 31 "\x01" // record size 32 "\x10" // type name size 33 "^MyOptional<.+>$" // type name 34 "\x00" // flags 35 "\x00" // sig_summary 36 "\x8d" // program size 37 "\x01" // program size 38 "\x1\x22\x7Storage#\x12\x60\x1,C\x10\x1\x5\x11\x2\x1\x22\x6hasVal#" 39 "\x12\x60\x1,\x10\x1e\x2\x22\x1b<could not read MyOptional>\x10G#!\x60 " 40 "\x0P\x10\x6\x22\x4None\x10\x36\x1#\x15\x60 " 41 "\x0#\x16\x60\x5\x22\x5value#\x12\x60\x5#\x17\x60\x1," 42 "\x10\x6\x22\x4None\x10\x11\x1#\x0\x60\x1#R\x60\x10\x3# " 43 "\x60\x10\x1\x2\x12\x12\x12\x12"; // summary function 44