map_values.qbk 1.0 KB

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  1. [/
  2. Copyright 2010 Neil Groves
  3. Distributed under the Boost Software License, Version 1.0.
  4. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  5. /]
  6. [section:map_values map_values]
  7. [table
  8. [[Syntax] [Code]]
  9. [[Pipe] [`rng | boost::adaptors::map_values`]]
  10. [[Function] [`boost::adaptors::values(rng)`]]
  11. ]
  12. * [*Precondition:] The `value_type` of the range is an instantiation of `std::pair`.
  13. * [*Postcondition:] For all elements `x` in the returned range, `x` is the result of `y.second` where `y` is the corresponding element in the original range.
  14. * [*Range Category:] __single_pass_range__
  15. * [*Range Return Type:] for constant ranges, `boost::select_second_const<decltype(rng)>` otherwise `boost:select_second_mutable<decltype(rng)>`
  16. * [*Returned Range Category:] The range category of `rng`.
  17. [section:map_values_example map_values example]
  18. [import ../../../test/adaptor_test/map_values_example.cpp]
  19. [map_values_example]
  20. [endsect]
  21. This would produce the output:
  22. ``
  23. 0,10,20,30,40,50,60,70,80,90,
  24. ``
  25. [endsect]