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33 lines
1.2 KiB
C
33 lines
1.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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// Helper functions for range manipulations
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#ifndef RANGE_H
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#define RANGE_H
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// Move a range in a vector to a different position.
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// The parameters are given according to the usual STL-semantics:
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// v: a container with STL-like random access iterator via std::begin(...)
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// rangeBegin: index of first element
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// rangeEnd: index one *past* last element
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// destination: index to element before which the range will be moved
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// Owing to std::begin() magic, this function works with STL-like containers:
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// QVector<int> v{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
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// move_in_range(v, 1, 4, 6);
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// as well as with C-style arrays:
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// int array[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
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// move_in_range(array, 1, 4, 6);
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// Both calls will have the following effect:
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// Before: 0 1 2 3 4 5 6 7 8 9
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// After: 0 4 5 1 2 3 6 7 8 9
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// No sanitizing of the input arguments is performed.
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template <typename Range>
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void move_in_range(Range &v, int rangeBegin, int rangeEnd, int destination)
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{
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auto it = std::begin(v);
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if (destination > rangeEnd)
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std::rotate(it + rangeBegin, it + rangeEnd, it + destination);
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else if (destination < rangeBegin)
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std::rotate(it + destination, it + rangeBegin, it + rangeEnd);
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}
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#endif
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