c++ - SendInviteResult - 无效使用不完整类型'class firebase::Future'

Question

在 C++ 上，如何发送邀请？

firebase::invites::InvitesSender *sender = new firebase::invites::InvitesSender(*_app);
sender->SetTitleText("Invite Friends");
sender->SetMessageText("Try my app today, and get 200 free coins!");
sender->SetCallToActionText("Download now!");
sender->SendInvite();

编译器给出错误：

error: invalid use of incomplete type 'class firebase::Future<firebase::invites::InvitesSender::SendInviteResult>'
     sender->SendInvite();
firebase_cpp_sdk\include/firebase/invites/sender.h:12:7: error: declaration of 'class firebase::Future<firebase::invites::InvitesSender::SendInviteResult>'
 class Future;

Answer 1

找到了！它需要包括：

#include <firebase/future.h>