Re: [Boost-users] Writing an inline nullary function object?

De : Robert Jones

How can I write an inline nullary function object, returning a fixed value? The equivalent of this...

int x = 4;

int f( ) { return x; }

boost::function<int()> g = f;

but without defining the intermediate f()?

I thought this might work...

boost::function<int()> g = bind(bind(apply<int>(), _1 ), x );

With Lambda, you could write: boost::function<int()> g = boost::lambda::constant(4); or, if you want to refer to a variable, and have g() return the *current* value of that variable: int i = 4; boost::function<int()> g = boost::lambda::var(i); assert(g() == 4); i = 5; (assert(g() == 5); I'm not aware of something equivalent for Bind, however.