小编Flo*_*Flo的帖子

不知道如何更好地描述它.这是代码.这无法在gcc 4.9.2(Debian 8.5)上进行编译,我认为它很难在以前的版本中编译.只有当我在lambda设置中访问后来声明的结构的成员作为默认参数时,问题似乎才会发生.其他显示的案例工作.

// Test program
class C1
{
private:
    // Forward-declared
    struct S_Private;
    S_Private* d_;

public:
    void func();
};

struct C1::S_Private
{
    int a;
};

void C1::func()
{
    // This will work
    int test = d_->a;

    // Accessing the d_->a as a default argument in lambda setup
    // will NOT work:
    // error: invalid use of non-static data member ‘C1::d_’
    auto some_lambda = [&](int arg = d_->a)
    {
        // This will also work
        int test2 = d_->a;
    };
} …