Could someone please help me understand why the following code does not compile (g++ 4.8). My understanding is that one could initialize a POD
#include <iostream>
#include <type_traits>
struct my_int
{
int val_;
};
struct B : public my_int
{
};
int main()
{
std::cout << std::is_pod<my_int>::value << std::endl;
std::cout << std::is_pod<B>::value << std::endl;
const my_int v = { 123 };
//const B v2 = { 123 }; // does not compile with g++ 4.8.
return 0;
}
Compilation is:
g++ -std=c++11 t.cxx
t.cxx: In function 'int main()':
t.cxx:24:21: error: could not convert '{123}' from '<brace-enclosed initializer list>' to 'const B'
const B v = { 123 };
^
EDIT:
Thanks to everyone answer I now understand the concept of aggregate initialisation. I missed the fact that aggregate could not have base class. Therefore my current implementation plans needs to be changed. I wanted to do something like:
template < typename T >
struct base_class
{
int val_;
};
struct MyInt : public base_class<int>
{
void Func1() {}
};
struct MyDouble : public base_class<double>
{
void Func2() {}
};
I'll rework the above code to avoid the use of subclass to introduce special member functions, while avoid code duplication.
