Why is the std::initializer_list constructor preferred when using a braced initializer list?

Question

Consider the code

#include 

class Foo
{
    int val_;
public:
    Foo(std::initializer_list il)
    {
        std::cout <<          


        

Answer 1

The whole initializer list thing was meant to enable list initialisation like so:

std::vector v { 0, 1, 2 };

Consider the case

std::vector v { 123 };

That this initializes the vector with one element of value 123 rather than 123 elements of value zero is intended.

To access the other constructor, use the old syntax

Foo foo(10);