QuantumGate::Callback::Callback

Constructs a QuantumGate::Callback object.

Signature

constexpr Callback() noexcept;

constexpr Callback(std::nullptr_t) noexcept;

template<typename F, /*condition*/>
constexpr Callback(F&& function) noexcept(/*condition*/);

template<typename T, typename F>
constexpr Callback(T* object, F&& member_function) noexcept

Parameters

Name	Description
function	A function pointer or a callable object.
object	A pointer to an object.
member_function	A member function pointer to invoke on object.

Exceptions

The overload accepting callable objects (lambdas etc.) may throw exceptions if memory allocation or move assignment fails.

Example

int FreeTestFunction(int n) noexcept
{
    return 10;
}

class TestClass
{
public:
    int MemberTestFunction(int n)
    {
        return 10;
    }
};

// Function pointer example
auto cb = Callback<int(int) noexcept>(&FreeTestFunction);

// Lambda example
Callback<int(int)> cb2([&](int n) -> int
{
    return 10;
});

// Member function pointer example
TestClass t;
Callback<int(int)> cb3(&t, &TestClass::MemberTestFunction);