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The new adaptor is like boost::adaptors::indirected, but for std::reference_wrapper values (instead of pointer). It calls .get() on every value and returns the result. It is useful for range-based iteration of ranges of std::reference_wrapper (or related) types.
33 lines
1.2 KiB
Plaintext
33 lines
1.2 KiB
Plaintext
[/
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Copyright 2015 Robin Eckert
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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:ref_unwrapped ref_unwrapped]
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[table
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[[Syntax] [Code]]
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[[Pipe] [`rng | boost::adaptors::ref_unwrapped`]]
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[[Function] [`boost::adaptors::ref_unwrap(rng)`]]
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]
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This adaptor produces a range than applies `.get()` on all values in
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the range. It is useful for iterating ranges of
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`std::reference_wrapper` values or values using similar semantics.
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The adaptor is C++11 (and above) only.
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* [*Precondition:] The `value_type` of the range has a `.get() const`.
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* [*Postcondition:] For all elements `x` in the returned range, `x` is the result of `y.get()` 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::unwrap_ref_range<decltype(rng)>`
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* [*Returned Range Category:] The range category of `rng`.
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[section:ref_unwrapped_example ref_unwrapped example]
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[import ../../../test/adaptor_test/ref_unwrapped_example.cpp]
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[ref_unwrapped_example]
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[endsect]
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This would produce the output `123`.
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[endsect]
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