I have a class member that looks like this
class Controller {
protected:
// other stuff
std::vector<Task<event_t, stackDepth>> taskHandlers;
//some more stuf
}
The Task
class is non-defaultConstructible, non-copyConstructible, non-copyAssignable but is moveConstructible and moveAssignable. Everything I could read (notably, std::vector
documentation) leads me to think that this should compile, but the error list looks like this (full output here) :
/usr/include/c++/9/bits/stl_uninitialized.h:127:72: error: static assertion failed: result type must be constructible from value type of input range
127 | static_assert(is_constructible<_ValueType2, decltype(*__first)>::value,
| ^~~~~
Making Task
defaultConstructible did not help. The error points to the definition of the class Controller
. I am using GCC 9.3.0 in c++17 mode. Did I do anything wrong ?
My best guess, given the current information, is that you messed up the move constructor syntax somehow - working example using just emplace_back
:
The below compiles fine, link to godbolt:
#include <vector>
class X
{
public:
X(int i) : i_(i){}
X() = delete;
X(const X&) = delete;
X(X&&) = default;//change this to 'delete' will give a similar compiler error
private:
int i_;
};
int main() {
std::vector<X> x;
x.emplace_back(5);
}