44 lines · cpp
1// A bare-bones llvm::Optional reimplementation.2 3template <typename T> struct MyOptionalStorage {4 MyOptionalStorage(T val) : value(val), hasVal(true) {}5 MyOptionalStorage() {}6 T value;7 bool hasVal = false;8};9 10template <typename T> struct MyOptional {11 MyOptionalStorage<T> Storage;12 MyOptional(T val) : Storage(val) {}13 MyOptional() {}14 T &operator*() { return Storage.value; }15};16 17void stop() {}18 19int main(int argc, char **argv) {20 MyOptional<int> x, y = 42;21 stop(); // break here22 return *y;23}24 25// Produced from the assembler in26// Shell/ScriptInterpreter/Python/Inputs/FormatterBytecode/formatter.py27__attribute__((used, section("__DATA_CONST,__lldbformatters"))) unsigned char28 _MyOptional_type_summary[] =29 "\x01" // version30 "\xa4" // record size31 "\x01" // record size32 "\x10" // type name size33 "^MyOptional<.+>$" // type name34 "\x00" // flags35 "\x00" // sig_summary36 "\x8d" // program size37 "\x01" // program size38 "\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 function44