小编mew*_*234的帖子

函数指针void*加载dlsym(),我可以把它投射到std::function？

假设lib中的函数声明是 int func(int);

using FuncType = std::function<int(int)>;
FuncType f = dlsym(libHandle, "func"); // can this work?
FuncType f = reinterpret_cast<FuncType>(dlsym(libHandle, "func")); // how about this?

// since we can dedfine a static array like this
int a[5] = {0};
// decltype(a[5]) is `int [5]`

// Then how about this way?
constexpr int sum(int a, int b) { return a + b; }
int a, b;
std::cin >> a >> b;
int arr[sum(a, b)] = {0};

它可以成功编译,但是是arr一个静态数组？当我尝试arr用typeid().name()或打印类型时boost::typeindex::type_id_with_cvr,我得到以下错误:

error: cannot create type information for type 'int [(<anonymous> + 1)]' because it involves types of variable size
 std::cout << typeid(decltype(arr)).name() …