iphone - UITableViewDataSource Delegate -

i created new master-detail application xcode template

i found main interface ( in case birdmasterviewcontroller ) inherit uitableviewcontroller, , uitableviewcontroller conform uitableviewdatasource protocol

so can specify methods like

- (nsinteger)numberofsectionsintableview:(uitableview *)tableview {     return 1; } 

but did not find set delegate _datasource variable on birdmasterviewcontroller, like

xxxxxx._datasource = self; or setdatasource: self 

to set _datasource object

// id <uitableviewdatasource>  _datasource; 

why delegation can run ?

add delegate in .h file , use delegate methods :

@interface birdmasterviewcontroller : uiviewcontroller<uitableviewdelegate,uitableviewdatasource>