用lambdas编译一个简单的C++ 0x程序时遇到麻烦

Question

我试图运行一个简单的lambda示例.

// lambda.cpp
#include <functional>
//#include <tr1/functional> 

int main()
{
   // Assign the same lambda expression to a function object.
   function<int (int, int)> f2 = [] (int x, int y) { return x + y; };
   //function<int (int, int)> f2 = [] (int x, int y) { return x + y; };
}

我正在编译它像这样:

$ g++ -std=c++0x -fpermissive lamdas.cpp
lambdas.cpp: In function ‘int main()’:    
lambdas.cpp:10: error: expected primary-expression before ‘=’ token
lambdas.cpp:10: error: expected primary-expression before ‘[’ token
lambdas.cpp:10: error: expected primary-expression before ‘]’ token
lambdas.cpp:10: error: expected primary-expression before ‘int’
lambdas.cpp:10: error: expected primary-expression before ‘int’
lambdas.cpp:10: error: expected ‘;’ before ‘{’ token

如何让它编译没有错误？

Answer 1

你的意思是std::function？

标准库功能位于std命名空间中.

_{你的复制/粘贴显然是假的也很有趣; 你写了"lamdas.cpp"然后编译"lambdas.cpp"!}