C++ error:expected ‘;’ at end of member declaration - c++

Question

#include <map>
#include <memory>
#include <iostream>
using namespace std;
class test
{
public:
test(){}
~test(){}
enum type
{
error = 0
};
private:
shared_ptr<map<int, type>> member_ = make_shared<map<int, type>>();//build error
//shared_ptr<map<type, int>> member_ = make_shared<map<type, int>>();//build ok
};
int main()
{
return 0;
}
when i compile program with "shared_ptr<map<int, type>> member_ = make_shared<map<int, type>>()"
main.cpp:17:63: error: expected ‘;’ at end of member declaration
shared_ptr<map<int, type>> member_ = make_shared<map<int, type>>();
^
main.cpp:17:67: error: expected unqualified-id before ‘>>’ token
shared_ptr<map<int, type>> member_ = make_shared<map<int, type>>();
^
main.cpp:17:58: error: wrong number of template arguments (1, should be at least 2)
shared_ptr<map<int, type>> member_ = make_shared<map<int, type>>();
^
In file included from /usr/include/c++/5/map:61:0,
from main.cpp:1:
/usr/include/c++/5/bits/stl_map.h:96:11: note: provided for ‘template<class _Key, class _Tp, class _Compare, class _Alloc> class std::map’
class map
^
main.cpp:17:42: error: parse error in template argument list
shared_ptr<map<int, type>> member_ = make_shared<map<int, type>>();
^
main.cpp:17:42: error: cannot resolve overloaded function ‘make_shared’ based on conversion to type ‘std::shared_ptr<std::map<int, test::type> >’

Answer 1

Have tried your code with Online C++ Compiler, got the same errors with C++, C++11, and C++14 compatible compilers, but got compiled well with C++17 compatible compiler. This means that your code is not legal in C++ standards prior to C++17. As pointed out by others, the code, however, compiled well on other online compiler sites even with C++11 and C++14 standards. So I would guess the errors are due to supported / unsupported features of compilers.

Answer 2

Well, you are not supposed to initialize class members like this anyway. The initialization of class members should happen in the class constructor, like so:
#include <map>
#include <memory>
#include <iostream>
using namespace std;
class test
{
public:
test() { member_ = make_shared<map<int, type>>(); }
~test() { }
enum type
{
error = 0
};
private:
shared_ptr<map<int, type>> member_;
};
int main()
{
return 0;
}
This compiles fine even in Online C++ Compiler which is the only place we are managing to reproduce the problem.