C++迭代器访问指针成员报错：表达式需指向类类型却为CharacterBase*

错误原因 #

你的ptrCharacterTurnOrderArray是存储CharacterBase*指针的vector，迭代器iterator指向的是指针元素（而非对象本身）。当你用iterator->getCharacterName()时，相当于对CharacterBase*类型的指针再调用->，这不符合语法——你需要先拿到指针，再用->访问对象成员。

两种修复方案 #

方案1：解引用迭代器后访问指针成员 #

直接对迭代器解引用得到CharacterBase*指针，再用->调用成员函数：

player_ptr = &PC;
enemy_ptr = &Enemy;

ptrCharacterTurnOrderArray.push_back(player_ptr);
ptrCharacterTurnOrderArray.push_back(enemy_ptr);

for (auto iterator = ptrCharacterTurnOrderArray.begin(); iterator != ptrCharacterTurnOrderArray.end(); iterator++) {
    engineFeedback = engineFeedback + "\n Name: " + (*iterator)->getCharacterName() + "   Initiative: " + std::to_string((*iterator)->getCharacterInitiative()) + " Player Character Flag: " + std::to_string((*iterator)->getIsPlayerCharacter());
    (*iterator)->setCharacterTurnOrder(iterator - ptrCharacterTurnOrderArray.begin() + 1);
    engineFeedback = engineFeedback + "\nTurn Order: " +  std::to_string((*iterator)->getCharacterTurnOrder());
}

方案2：用范围for循环简化代码 #

范围for循环可以直接拿到vector里的指针元素，代码更简洁易读：

player_ptr = &PC;
enemy_ptr = &Enemy;

ptrCharacterTurnOrderArray.push_back(player_ptr);
ptrCharacterTurnOrderArray.push_back(enemy_ptr);

int turnOrder = 1;
for (auto char_ptr : ptrCharacterTurnOrderArray) {
    engineFeedback = engineFeedback + "\n Name: " + char_ptr->getCharacterName() + "   Initiative: " + std::to_string(char_ptr->getCharacterInitiative()) + " Player Character Flag: " + std::to_string(char_ptr->getIsPlayerCharacter());
    char_ptr->setCharacterTurnOrder(turnOrder++);
    engineFeedback = engineFeedback + "\nTurn Order: " +  std::to_string(char_ptr->getCharacterTurnOrder());
}

额外说明 #

之前处理对象引用的vector时，迭代器直接指向对象实例，所以iterator->xxx是正确的。但存储指针的vector里，迭代器指向的是指针变量，必须先拿到指针再访问成员——这是指针容器和对象容器的核心区别之一。

内容的提问来源于stack exchange，提问作者Strom