$ cat class.cc
struct S {
    int a;
    int b;
};

class C {
public:
    int a;
    int b;
};

int main()
{
    S s = {1, 2};
    C c = {3, 4};
    return 0;
}
$ make class
g++     class.cc   -o class
$ g++ --version
g++ (Debian 4.3.2-1.1) 4.3.2
Copyright (C) 2008 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

#include <iostream>

class Test {
public:
    int a;
    int b;
};

int main() {
    Test t = {2, 9};
    
    std::cout << t.a << " " << t.b << std::endl;
    
    return 0;
}

class Bar{
 int a;
 int b;
};
Bar b = {1,2}

test.cpp:36: ошибка: in C++98 ‘b’ must be initialized by constructor, not by ‘{...}’
test.cpp:36: предупреждение: extended initializer lists only available with -std=c++0x or -std=gnu++0x
RU>

#include <memory>
 
FILE* test(const char* name)
{
   typedef std::unique_ptr<FILE, void(*)(FILE*)> auto_file;
 
   auto_file file(fopen(name, "wb"), fclose);
 
   if(fputs("text", file.get()) == EOF)
      return NULL;

   fseek(file.get(), 0, SEEK_SET);

   return file.release();
}