lcaminiti wrote:
For example, I _think_ (but I've not implemented this yet) that I can simplify the syntax like this:
#include <contract.hpp> #include <vector> #include "myvector/pushable.hpp"
// Wrapper class that adds contracts to std::vector. CONTRACT_CLASS( template( typename T ) class (myvector) extends( public pushable<T> ) // Subcontracting. ) { CONTRACT_CLASS_INVARIANT( empty() == (size() == 0) // More invariants here (comma separated)... )
CONTRACT_FUNCTION( public void (push_back)( (const T&) element ) precondition( size() < max_size() // More preconditions here (comma separated)... ) postcondition( auto old_size = CONTRACT_OLDOF(size()), // Old value. size() == old_size + 1 // More postconditions here (comma separated)... ) ) { vector_.push_back(element); // Implementation. }
// Rest of the class here (with more contracts if needed)... public: typedef typename std::vector<T>::size_type size_type; size_type size(void) const { return vector_.size(); } size_type max_size(void) const { return vector_.max_size(); } bool empty(void) const { return vector_.empty(); } const T& back(void) const { return vector_.back(); } private: std::vector<T> vector_; };
For a side-by-side comparison with N1962 syntax:
http://svn.boost.org/svn/boost/sandbox/contract/libs/contract/doc/html/index... For a comparison of the entire std::vector (plus Boost.ConceptCheck concepts):
http://svn.boost.org/svn/boost/sandbox/contract/libs/contract/doc/html/contr... For a comparison for all Boost.Contract features (plus Boost.ConceptCheck concepts and Boost.Parameter named parameters):
http://svn.boost.org/svn/boost/sandbox/contract/libs/contract/doc/html/contr... (Don't pay attention to the rest of the docs that are way out of date.)
I was able to implement this syntax. If anyone is curious, I have attached the complete grammar of the syntax and the macro APIs to inspect the syntax's meta-traits: http://boost.2283326.n4.nabble.com/file/n3599946/grammar03.cpp grammar03.cpp For example, the macro APIs allow to program the following: #include <contract/detail/preprocessor/traits/func.hpp> #include <boost/preprocessor/facilities/is_empty.hpp> #include <boost/preprocessor/logical/compl.hpp> #define TRAITS_add CONTRACT_DETAIL_PP_FUNC_TRAITS( \ int (add) ( int x, int y ) \ ) #define TRAITS_push_back CONTRACT_DETAIL_PP_FUNC_TRAITS( \ public virtual void (push_back) ( (T&) value ) \ ) #define IS_VIRTUAL(func_traits) \ BOOST_PP_COMPL(BOOST_PP_IS_EMPTY(CONTRACT_DETAIL_PP_FUNC_TRAITS_VIRTUAL( \ func_traits))) IS_VIRTUAL(TRAITS_add) // expand to 0 (not declared virtual) IS_VIRTUAL(TRAITS_push_back) // expand to (declared virtual) #undef TRAITS_add #undef TRAITS_push_back Traits macros source code at: http://contractpp.svn.sourceforge.net/viewvc/contractpp/branches/syn/src/con... --Lorenzo -- View this message in context: http://boost.2283326.n4.nabble.com/contract-syntax-redesign-tp3563993p359994... Sent from the Boost - Dev mailing list archive at Nabble.com.