help with constructor function

[alexas]

Hello,

I am using a library in which the following constructor is described:

static_assert(std::is_same<T, bool>()
                || std::is_same<T, int>()
                || std::is_same<T, long>()
                || std::is_same<T, long long>()
                || std::is_same<T, float>()
                || std::is_same<T, double>()
                || std::is_same<T, long double>(),
                "Invalid scalar type for Quaternion");


  Quaternion(T a = 0, T b = 0, T c = 0, T d = 0)
  : _a(a), _b(b), _c(c), _d(d) { }

And now I am trying to create the Quaternion:

auto q=Quaternion(1,0,0,0)

Yet is not allowed, and I am getting the message from my IDE that "Ambiguous deduction for template arguments of 'Quaternion'"

Could someone please explain how to use such constructor?

[alexas]

This was unexpected, it seems that actually this is working...I simply did not run the code when I saw that IDE warning.. So once again, how exactly I should write the statement not to get that warning? As it seems for me that I am showing all the members

[mbozzi]

Can't say without seeing the declaration of the class template and any deduction guides.

You can probably just write
auto q = Quaternion<double>(1, 0, 0, 0);

[alexas]

Thank you very much, you were totally right! Thanks again!!!

[dhayden]

Since you're passing integers, I assume that's what you want, in which case it should probably be:
auto q = Quaternion<int>(1,0,0,0);

[dutch]

Here's the library: https://github.com/ferd36/quaternions