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An object of a struct/class (that has no constructor) can be created using an initializer list. Why is this not allowed on struct/class with constructor?
struct r { int a; };
struct s { int a; s() : a(0) {} };
r = { 1 }; // works
s = { 1 }; // does not work
No, an object with a constructor is no longer considered a POD (plain old data). Objects must only contain other POD types as non-static members (including basic types). A POD can have static functions and static complex data members.
Note that the upcoming C++ standard will allow you to define initializer lists, which will allow non-POD objects to be initialized with braces.