我的实际问题在下面的粗体文字中，但这是我问题的背景：
我尝试使用Boost :: serialization来保存和恢复玩家的状态。我在http://www.boost.org/doc/libs/1_56_0/libs/serialization/doc/tutorial.html#simplecase阅读了教程，但我不确定如何
boost::archive::text_iarchive
的工作原理。
我正在假设以下几行
boost::archive::text_iarchive inArchive(playerfile);
inArchive >> target;
会根据播放器文件的相应文本文件初始化目标吗？
我用这个假设写了以下函数：
bool SavePlayerState(Player *target)
{
std::string fileName = (target->name) + ".playerfile";
std::ofstream playerfile(fileName);
if(!playerfile.is_open())
{
s_al_show_native_message_box(display, "SAVE FAILURE", "SAVE FAILURE", fileName + "could not be created/opened.",
NULL, ALLEGRO_MESSAGEBOX_ERROR);
return false;
}
boost::archive::text_oarchive outArchive(playerfile);
outArchive << target;
return true;
}
bool LoadPlayerState(std::string playerName, Player *target)
{
std::string fileName = playerName + ".playerfile";
std::ifstream playerfile(fileName);
if(!playerfile.is_open())
{
s_al_show_native_message_box(display, "LOAD FAILURE", "LOAD FAILURE", fileName + "could not be found/opened.",
NULL, ALLEGRO_MESSAGEBOX_ERROR);
return false;
}
boost::archive::text_iarchive inArchive(playerfile);
inArchive >> target;
return true;
}
为了测试目的，在main（）中调用它们：
int main(int argc, char *argv[])
{
//...
player = new Player(5,5); // There is a Player*player; declared elsewhere
LoadPlayerState("player", player); //Load the file with this name, target is player object
beings.push_back(player);
//The game's operations...
SavePlayerState(player);
delete player;
//...
return 0;
}
SavePlayerState（播放器）;按照我的预期工作，我发现在我的目录中创建了player.playerfile。但是LoadPlayerState（＆＃34;播放器＆＃34;，播放器）;给我以下错误：
C:\Development\Libraries\boost\boost\serialization\access.hpp|132|error: no matching function for call to 'Player::Player()'|
我不知道为什么构造函数应该有问题，或者为什么Save工作而不是Load。我没有尝试制作新的Player对象，只是根据存档塑造现有的目标Player。为了使这项工作，我需要改变什么？
我的玩家类：
#ifndef PLAYER_H_INCLUDED
#define PLAYER_H_INCLUDED
#include "being.h"
#include "extfile.h"
#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>
#include <boost/serialization/base_object.hpp>
#include <boost/serialization/vector.hpp>
class Player: public Being
{
friend class boost::serialization::access;
template<class PlayerArchive>
void serialize(PlayerArchive & par, const unsigned int version)
{
par & boost::serialization::base_object<Being>(*this);
par & active;
//par & various things
}
public:
Player(bool savedPlayer);
Player(int spawnXCell, int spawnYCell);
~Player();
//Functions
};
//Prototype to the save and Load state functions mentioned previously are found here.
#endif // PLAYER_H_INCLUDED
这是我的完整构建消息日志，如果它有帮助：
>||=== Build: Debug in Roguelike (compiler: GNU GCC Compiler) ===| >C:\Development\Libraries\boost\boost\serialization\access.hpp||In instantiation of 'static void boost::serialization::access::construct(T*) [with T = Player]':| >C:\Development\Libraries\boost\boost\serialization\serialization.hpp|93|required from 'void boost::serialization::load_construct_data(Archive&, T*, unsigned int) [with Archive = boost::archive::text_iarchive; T = Player]'| >C:\Development\Libraries\boost\boost\serialization\serialization.hpp|158|required from 'void boost::serialization::load_construct_data_adl(Archive&, T*, unsigned int) [with Archive = boost::archive::text_iarchive; T = Player]'| >C:\Development\Libraries\boost\boost\archive\detail\iserializer.hpp|341|required from 'void boost::archive::detail::pointer_iserializer::load_object_ptr(boost::archive::detail::basic_iarchive&, void*, unsigned int) const [with Archive = boost::archive::text_iarchive; T = Player]'| >C:\Development\Projects\Roguelike\Roguelike\player.cpp|76|required from here| >C:\Development\Libraries\boost\boost\serialization\access.hpp|132|error: no matching function for call to 'Player::Player()'| >C:\Development\Libraries\boost\boost\serialization\access.hpp|132|note: candidates are:| >C:\Development\Projects\Roguelike\Roguelike\player.cpp|8|note: Player::Player(int, int)| >C:\Development\Projects\Roguelike\Roguelike\player.cpp|8|note: candidate expects 2 arguments, 0 provided| >C:\Development\Projects\Roguelike\Roguelike\player.cpp|3|note: Player::Player(bool)| >C:\Development\Projects\Roguelike\Roguelike\player.cpp|3|note: candidate expects 1 argument, 0 provided| >C:\Development\Projects\Roguelike\Roguelike\player.h|12|note: Player::Player(const Player&)| >C:\Development\Projects\Roguelike\Roguelike\player.h|12|note: candidate expects 1 argument, 0 provided| ||=== Build failed: 1 error(s), 5 warning(s) (0 minute(s), 4 second(s)) ===|
非常感谢。如果需要任何其他信息，我会追加它。
答案 0 :(得分：1)
错误信息非常清楚：
no matching function for call to 'Player::Player()'
您的班级必须有默认构造函数。
答案 1 :(得分：1)
除了Joachim所说的，在某些情况下，您将无法使类型默认构造（特别是当您向第三方库中的类型添加非侵入式序列化时）。
在这种情况下，请了解load_construct_data自定义点：
此机制已自动用于您，例如在STL容器的反序列化中，其元素类型没有默认构造函数。