How to create a vector with a non-copyable struct?

[ricardomatias]

I'm trying to create the following vector of structs (with copy constructor deleted) in place and I cannot compile it. I'd like to understand why and what are the alternatives.

etl::vector<NonCopyable, 2> { NonCopyable{1}, NonCopyable{2} }; // error

Is it because etl::vector doesn't implement a std:initializer_list? Or because the structs are rvalues? Or some other reason?

[jwellbelove]

The ETL does support std::initializer_list. There are implementations for Visual Studio's compiler and GCC/Clang.

[jwellbelove]

This code doesn't work with std::vector either.

Error C2280 'NonCopyable::NonCopyable(const NonCopyable &)': attempting to reference a deleted function

#include <vector>

struct NonCopyable
{
  NonCopyable(int i_)
    : i(i)
  {
  }

  NonCopyable(NonCopyable&&) = default;
  NonCopyable& operator =(NonCopyable&&) = default;

  NonCopyable(const NonCopyable&) = delete;
  NonCopyable& operator =(const NonCopyable&) = delete;

  int i;
};

int main()
{
  std::vector<NonCopyable> { NonCopyable{ 1 }, NonCopyable{ 2 } };
}

[jwellbelove]

This works.

#include "etl/vector.h"

struct NonCopyable
{
  NonCopyable(int i_)
    : i(i)
  {
  }

  NonCopyable(NonCopyable&&) = default;
  NonCopyable& operator =(NonCopyable&&) = default;

  NonCopyable(const NonCopyable&) = delete;
  NonCopyable& operator =(const NonCopyable&) = delete;

  int i;
};

int main()
{
  etl::vector<NonCopyable, 2> v;

  v.emplace_back(NonCopyable{ 1 });
  v.emplace_back(NonCopyable{ 2 });
}

[jwellbelove]

From Stackoverflow:-

std::initializer_list references static memory. That's what the class is for. You cannot move from static memory, because movement implies changing it. You can only copy from it

[ricardomatias]

Thank your for all your replies @jwellbelove, they're very helpful in understand this.