小编use*_*032的帖子

我使用Scala 2.10.0RC1和sbt 0.12.1.是什么原因以及如何修复此运行时错误(在2.9.2上正常运行)？

确切的错误消息是:

java.lang.NoSuchMethodError:scala.Predef $ ArrowAssoc $ .extension $$减$ more(Ljava/lang/Object; Ljava/lang/Object;)Lscala/Tuple2;

我正在尝试在Raspberry Pi上编译代码w/shared_ptrs:

#include <iostream>
using namespace std;
int main(int argc, char* argv[]){
   shared_ptr<string> message1(new string("Hello Raspberry Pi C++11"));
   cout << *message1 <<endl;
   return 0;
}

我收到以下错误:

test.cpp: In function 'int main(int, char**)': test.cpp:4:4: error: 'shared_ptr' was not declared in this scope
    shared_ptr<string> message1(new string("Hello Raspberry Pi C++11"));
    ^ test.cpp:4:21: error: expected primary-expression before '>' token
    shared_ptr<string> message1(new string("Hello Raspberry Pi C++11"));
                     ^ test.cpp:4:70: error: 'message1' was not declared in this scope
    shared_ptr<string> message1(new string("Hello Raspberry Pi C++11"));

我用这个命令编译:g++ -std=c++11 …