我正在尝试使用lambda表达式在循环中通过cin
输入循环索引的值:
#include<iostream>
using namespace std;
int main(){
for(int a, ([](int & b){cin>>b;})(a); a < 2; ++a);
return 0;
}
在Ubuntu上使用g++ 4.5编译时,出现以下错误:
forLoopAndCinTest.c++: In function ‘int main()’:
forLoopAndCinTest.c++:5:14: error: expected unqualified-id before ‘[’ token
forLoopAndCinTest.c++:5:14: error: expected ‘)’ before ‘[’ token
forLoopAndCinTest.c++:5:34: error: expected primary-expression before ‘)’ token
forLoopAndCinTest.c++:5:34: error: expected ‘;’ before ‘)’ token
forLoopAndCinTest.c++:5:40: error: name lookup of ‘a’ changed for ISO ‘for’ scoping
forLoopAndCinTest.c++:5:40: note: (if you use ‘-fpermissive’ G++ will accept your code)
forLoopAndCinTest.c++:5:50: error: expected ‘;’ before ‘)’ token
如果我使用普通函数而不是lambda函数,程序可以编译通过。
使用-fpermissive也没有帮助。
有什么想法吗?