C++ 未定义模板 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >' 的隐式实例化
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Implicit instantiation of undefined template 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >'
提问by Andrew
In the project I have been working on, we have to send Cocoa notifications from C++ sub-projects to the main project above it. To do this we construct a map to act as a key-value store for the userInfo dictionary of the notification.
在我一直在做的项目中，我们要从C++子项目向它上面的主项目发送Cocoa通知。为此，我们构造了一个映射作为通知的 userInfo 字典的键值存储。
In one of the projects, the following code compiles just fine:
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);
However, when this is copied into an identical file in another sub-project, the compiler throws the following on the userInfo->insert calls:
但是，当将其复制到另一个子项目中的相同文件中时，编译器会在 userInfo->insert 调用中抛出以下内容：
"Implicit instantiation of undefined template 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >'"
..and it cannot find the function for PostCocoaNotification:
..它找不到 PostCocoaNotification 的函数：
No matching function for call to 'PostCocoaNotification'
Additionally, it throws the following errors in system headers:
此外，它会在系统标头中引发以下错误：
/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> > > > *')
I've no idea what I've done to cause such chaos, especially when the code runs perfectly fine in another sub-project (successfully sending notifications). Any insight to the problem would be very welcome.
我不知道我做了什么导致这种混乱，尤其是当代码在另一个子项目中运行得很好时（成功发送通知）。对这个问题的任何见解将是非常受欢迎的。
回答by Mauro Bilotti
You need to include these headers:
您需要包含这些标题：
#include <string>
#include <sstream>
#include <iostream>
