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#include <memory>
 
 
struct IMoo {};
struct MooA : public IMoo {};
struct MooB : public IMoo {};
 
class Foo
{
public:
    Foo() : m_moo(false ? std::make_shared<MooA>() : std::make_shared<MooB>())
    {
    }
private:
    std::shared_ptr<IMoo> m_moo;
};
 
 
int main() {
}

prog.cpp: In constructor ‘Foo::Foo()’:
prog.cpp:11:77: error: no match for ternary ‘operator?:’ (operand types are ‘bool’, ‘std::shared_ptr<MooA>’, and ‘std::shared_ptr<MooB>’)
     Foo() : m_moo(false ? std::make_shared<MooA>() : std::make_shared<MooB>())
                                                                             ^
prog.cpp:11:77: note: candidate is:
prog.cpp:11:77: note: operator?:(bool, int, int) <built-in>
prog.cpp:11:77: note:   no known conversion for argument 2 from ‘std::shared_ptr<MooB>’ to ‘int’

Standard output is empty