Section: 99 [depr.lib.binders] Status: CD1 Submitter: Daniel Krügler Opened: 2008-02-14 Last modified: 2016-01-28 10:19:27 UTC
Priority: Not Prioritized
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Discussion:
N2521 and its earlier predecessors have moved the old binders from [lib.binders] to 99 [depr.lib.binders] thereby introducing some renaming of the template parameter names (Operation -> Fn). During this renaming process the protected data member op was also renamed to fn, which seems as an unnecessary interface breakage to me - even if this user access point is probably rarely used.
Proposed resolution:
Change [depr.lib.binder.1st]:
template <class Fn> class binder1st : public unary_function<typename Fn::second_argument_type, typename Fn::result_type> { protected: Fnfnop; typename Fn::first_argument_type value; public: binder1st(const Fn& x, const typename Fn::first_argument_type& y); typename Fn::result_type operator()(const typename Fn::second_argument_type& x) const; typename Fn::result_type operator()(typename Fn::second_argument_type& x) const; };-1- The constructor initializes
fnop with x and value with y.-2- operator() returns
fnop(value,x).
Change [depr.lib.binder.2nd]:
template <class Fn> class binder2nd : public unary_function<typename Fn::first_argument_type, typename Fn::result_type> { protected: Fnfnop; typename Fn::second_argument_type value; public: binder2nd(const Fn& x, const typename Fn::second_argument_type& y); typename Fn::result_type operator()(const typename Fn::first_argument_type& x) const; typename Fn::result_type operator()(typename Fn::first_argument_type& x) const; };-1- The constructor initializes
fnop with x and value with y.-2- operator() returns
fnop(value,x).