Any difference between copy-list-initialization and traditional copy-initialization?

Question

Except for supporting multiple arguments, disallowing narrowing conversion, matching constructor taking std::initializer_list argument, what else is different for copy-list-init

Answer 1

Copy-initialization always considers availability of copy constructors, while copy-list-initialization doesn't.

class B {};
struct A 
{
  A(B const&) {}
  A(A const&) = delete;
};

B b;
A a1 = {b};  // this compiles
A a2 = b;    // this doesn't because of deleted copy-ctor

This is because copy-list-initialization is identical to direct-list-initialization except in one situation - had A(B const&) been explicit, the former would've failed, while the latter will work.

class B {};
struct A 
{
  explicit A(B const&) {}
};


int main()
{
    B b;
    A a1{b};    // compiles
    A a2 = {b}; // doesn't compile because ctor is explicit
}