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development:cpp:differences

Difference between “::” “.” and “->” in c++

  • - > for accessing object member variables and methods via pointer to object
Foo *foo = new Foo();
foo->member_var = 10;
foo->member_func();
  • . for accessing object member variables and methods via object instance
Foo foo;
foo.member_var = 10;
foo.member_func();
  • :: for accessing static variables and methods of a class/struct or namespace. It can also be used to access variables and functions from another scope (actually class, struct, namespace are scopes in that case)
int some_val = Foo::static_var;
Foo::static_method();
int max_int = std::numeric_limits<int>::max();
development/cpp/differences.txt · Last modified: 2017/12/07 10:52 by tplecko