Detect if a type is a std::tuple?

Question

Currently I have two functions :

template bool f(Type* x);
template bool f(std::tuple* x);
         


        

Answer 1

Might be a little late but you can also do something like this, in a more modern c++17 style with template variables:

template 
constexpr bool IsTuple = false;
template
constexpr bool IsTuple>   = true;

And some tests

struct TestStruct{};

static_assert(IsTuple == false,                "Doesn't work with literal.");
static_assert(IsTuple == false,         "Doesn't work with classes.");
static_assert(IsTuple>,       "Doesn't work with plain tuple.");
static_assert(IsTuple>,     "Doesn't work with lvalue references");
static_assert(IsTuple>,   "Doesn't work with rvalue references");

You can view it here https://godbolt.org/z/FYI1jS

EDIT: You will want to run std::decay, std::remove_volatile, std::remove_const to handle special cases.