在我正在工作的项目中,我们需要将来自C++子项目的Cocoa通知发送到其上方的主项目。为此,我们构建了一个地图,作为通知的userInfo字典的键值存储。
在其中一个项目中,以下代码编译得很好:
std::map<std::string, std::string> *userInfo = new std::map<std::string, std::string>;
char buffer[255];
sprintf(buffer, "%i", intValue1);
userInfo->insert(std::pair<std::string, std::string>("intValue1", std::string(buffer)));
sprintf(buffer, "%i", intValue2);
userInfo->insert(std::pair<std::string, std::string>("intValue2", std::string(buffer)));
if(condition)
userInfo->insert(std::pair<std::string, std::string>("conditionalValue", "true"));
PostCocoaNotification("notificationName", *userInfo);
但是,当这段代码复制到另一个子项目中的相同文件中时,编译器会在userInfo->insert调用上抛出以下异常:
"Implicit instantiation of undefined template 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >'"
...它找不到PostCocoaNotification函数:
No matching function for call to 'PostCocoaNotification'
此外,它在系统标头中抛出以下错误:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk/usr/include/c++/4.2.1/bits/stl_pair.h:73:11: Implicit instantiation of undefined template 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >'
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk/usr/include/c++/4.2.1/bits/stl_pair.h:74:11: Implicit instantiation of undefined template 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >'
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk/usr/include/c++/4.2.1/bits/stl_pair.h:73:11: Implicit instantiation of undefined template 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >'
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk/usr/include/c++/4.2.1/bits/stl_tree.h:1324:13: Cannot initialize a parameter of type '_Link_type' (aka '_Rb_tree_node<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > *') with an rvalue of type '_Const_Link_type' (aka 'const _Rb_tree_node<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > *')
我不知道我做了什么导致这样的混乱,特别是当代码在另一个子项目中完美运行(成功发送通知)时。对于问题的任何见解都将非常受欢迎。
string
。 - doctorlovestd::map<std::string, std::string> *telemetry = new std::map<std::string, std::string>;
) 没有抛出任何错误。 - Andrew