cpp template <class T1, class T2> classcompressed_pair{ public: typedef T1 first_type; typedef T2 second_type; typedef typenamecall_traits<first_type>::param_type first_param_type; typedef typenamecall_traits<second_type>::param_type second_param_type; typedef typenamecall_traits<first_type>::reference first_reference; typedef typenamecall_traits<second_type>::reference second_reference; typedef typenamecall_traits<first_type>::const_reference first_const_reference; typedef typenamecall_traits<second_type>::const_reference second_const_reference; compressed_pair() : base() {} compressed_pair(first_param_type x, second_param_type y); explicit compressed_pair(first_param_type x); explicit compressed_pair(second_param_type y); compressed_pair& operator=(const compressed_pair&); first_reference first(); first_const_reference first() const; second_reference second(); second_const_reference second() const; void swap(compressed_pair& y); };
The two members of the pair can be accessed using the member functions first() and second(). Note that not all member functions can be instantiated for all template parameter types. In particular compressed_pair can be instantiated for reference and array types, however in these cases the range of constructors that can be used is limited. If types T1 and T2 are the same type, then there is only one version of the single-argument constructor, and this constructor initialises both values in the pair to the passed value.
Note that if either member is a POD type, then that member is not zero-initialized by the compressed_pair default constructor: it is up to you to supply an initial value for these types if you want them to have a default value.
Note that compressed_pair can not be instantiated if either of the template arguments is a union type, unless there is compiler support for boost::is_union, or if boost::is_union is specialised for the union type.
Finally, a word of caution for Visual C++ 6 users: if either argument is an empty type, then assigning to that member will produce memory corruption, unless the empty type has a "do nothing" assignment operator defined. This is due to a bug in the way VC6 generates implicit assignment operators.
Based on contributions by Steve Cleary, Beman Dawes, Howard Hinnant and John Maddock.
Maintained by John Maddock.
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4