C++ (Cpp) Instruction::GetOperand示例

bool DefUseManager::WhileEachUse(
    const Instruction* def,
    const std::function<bool(Instruction*, uint32_t)>& f) const {
  // Ensure that |def| has been registered.
  assert(def && (!def->HasResultId() || def == GetDef(def->result_id())) &&
         "Definition is not registered.");
  if (!def->HasResultId()) return true;

  auto end = id_to_users_.end();
  for (auto iter = UsersBegin(def); UsersNotEnd(iter, end, def); ++iter) {
    Instruction* user = iter->second;
    for (uint32_t idx = 0; idx != user->NumOperands(); ++idx) {
      const Operand& op = user->GetOperand(idx);
      if (op.type != SPV_OPERAND_TYPE_RESULT_ID && spvIsIdType(op.type)) {
        if (def->result_id() == op.words[0]) {
          if (!f(user, idx)) return false;
        }
      }
    }
  }
  return true;
}