I have a class Foo with the ONLY constructer Foo(int length). I also have a class ´Bar´ with the member Foo myFoo = myFoo(100) how would I initialize that? I can only initialize it if it has no length parameter in Foo constructer.
Thanks in advance
This questions has come many times. You use constructor initialization lists to do that:
class Bar { Bar() : myFoo( 100 ) {} Foo myFoo; }; Those initialization lists let you call constructors for base classes as well as for members, and is the intended way to initialize them.
Bar::Bar() : myFoo(100) { // constructor code } I'm not sure if I understood you correctly, but normally members are initialized in constructor initializer lists:
class Bar { public: Bar(); private: Foo myFoo; }; Bar::Bar() // The following initializes myFoo : myFoo(100) // constructor body { } Note that if Bar has several constructors, you have to initialize myFoo in each of them.
C++11 added initialization directly in the member declaration, like this:
class Bar { Foo myFoo = Foo(100); }; However your compiler might not support that yet, or only support it with special flags.
