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32 lines
963 B
Plaintext
32 lines
963 B
Plaintext
[/
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Copyright 2010 Neil Groves
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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/]
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[section:map_keys map_keys]
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[table
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[[Syntax] [Code]]
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[[Pipe] [`rng | boost::adaptors::map_keys`]]
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[[Function] [`boost::adaptors::keys(rng)`]]
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]
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* [*Precondition:] The `value_type` of the range is an instantiation of `std::pair`.
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* [*Postcondition:] For all elements `x` in the returned range, `x` is the result of `y.first` where `y` is the corresponding element in the original range.
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* [*Range Category:] __single_pass_range__
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* [*Range Return Type:] `boost::select_first_range<decltype(rng)>`
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* [*Returned Range Category:] The range category of `rng`.
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[section:map_keys_example map_keys example]
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[import ../../../test/adaptor_test/map_keys_example.cpp]
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[map_keys_example]
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[endsect]
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This would produce the output:
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``
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0,1,2,3,4,5,6,7,8,9,
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``
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[endsect]
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