lambda中参数的移动捕捉

http://coliru.stacked-crooked.com/a/ef442eca9b74c8f1

Move capture in lambda

#include <string>
#include <iostream>
#include <functional>
class B{};
void f(B&& b){}
int main(){
    B b;
    auto func_lambda=[b{std::move(b)}](){
        //f(std::move(b));  // also fails
        f(b); // also fails
    };
    //: std::function<void()> func_cache=func_lambda(); 
    //       will be stored and called after 'b' is out of scope
}

我有个错误:-

错误:无法将“B&类型的右值引用绑定到“const B”类型的左值 主.cpp:5:12:注意:正在初始化“void f(B&)”的参数1

我也试过了 [b=std::move(b)] Passing a lambda with moved capture to function ).