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65 lines
2.1 KiB
Plaintext
65 lines
2.1 KiB
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:equal equal]
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[heading Prototype]
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``
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template<
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class SinglePassRange1,
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class SinglePassRange2
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>
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bool equal(const SinglePassRange1& rng1,
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const SinglePassRange2& rng2);
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template<
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class SinglePassRange1,
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class SinglePassRange2,
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class BinaryPredicate
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>
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bool equal(const SinglePassRange1& rng1,
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const SinglePassRange2& rng2,
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BinaryPredicate pred);
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``
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[heading Description]
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`equal` returns `true` if `distance(rng1)` is equal to the `distance(rng2)` and for each element `x` in `rng1`, the corresponding element `y` in `rng2` is equal. Otherwise `false` is returned.
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In this range version of `equal` it is perfectly acceptable to pass in two ranges of unequal lengths.
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Elements are considered equal in the non-predicate version if `operator==` returns `true`. Elements are considered equal in the predicate version if `pred(x,y)` is `true`.
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[heading Definition]
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Defined in the header file `boost/range/algorithm/equal.hpp`
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[heading Requirements]
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[*For the non-predicate versions:]
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* `SinglePassRange1` is a model of the __single_pass_range__ Concept.
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* `SinglePassRange2` is a model of the __single_pass_range__ Concept.
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* `SinglePassRange1`'s value type is a model of the `EqualityComparableConcept`.
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* `SinglePassRange2`'s value type is a model of the `EqualityComparableConcept`.
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* `SinglePassRange1`'s value type can be compared for equality with `SinglePassRange2`'s value type.
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[*For the predicate versions:]
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* `SinglePassRange1` is a model of the __single_pass_range__ Concept.
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* `SinglePassRange2` is a model of the __single_pass_range__ Concept.
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* `BinaryPredicate` is a model of the `BinaryPredicateConcept`.
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* `SinglePassRange1`'s value type is convertible to `BinaryPredicate`'s first argument type.
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* `SinglePassRange2`'s value type is convertible to `BinaryPredicate`'s second argument type.
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[heading Complexity]
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Linear. At most `min(distance(rng1), distance(rng2))` comparisons.
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[endsect]
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