std::vector<bool>
| Defined in header <vector>
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| template<class Allocator> class vector<bool, Allocator>; |
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std::vector<bool> is a space-efficient specialization of std::vector for the type bool.
The manner in which std::vector<bool> is made space efficient (as well as whether it is optimized at all) is implementation defined. One potential optimization involves coalescing vector elements such that each element occupies a single bit instead of sizeof(bool) bytes.
std::vector<bool> behaves similarly to std::vector, but in order to be space efficient, it:
- Does not necessarily store its elements as a contiguous array (so &v[0] + n != &v[n])
- Exposes class std::vector<bool>::reference as a method of accessing individual bits. In particular, objects of this class are returned by operator[] by value.
- Does not use std::allocator_traits::construct to construct bit values.
- Does not guarantee that different elements in the same container can be modified concurrently by different threads.
Contents |
[edit] Member types
| Member type | Definition |
value_type
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bool |
allocator_type
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Allocator
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size_type
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implementation-defined |
difference_type
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implementation-defined |
| proxy class representing a reference to a single bool (class) | |
const_reference
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bool |
pointer
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implementation-defined |
const_pointer
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implementation-defined |
iterator
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implementation-defined |
const_iterator
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implementation-defined |
reverse_iterator
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std::reverse_iterator<iterator> |
const_reverse_iterator
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std::reverse_iterator<const_iterator> |
[edit] Member functions
constructs the vector (public member function of std::vector)
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destructs the vector (public member function of std::vector)
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| assigns values to the container (public member function of std::vector)
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| assigns values to the container (public member function of std::vector)
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| returns the associated allocator (public member function of std::vector)
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Element access | |
| access specified element with bounds checking (public member function of std::vector)
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| access specified element (public member function of std::vector)
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| access the first element (public member function of std::vector)
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| access the last element (public member function of std::vector)
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Iterators | |
| returns an iterator to the beginning (public member function of std::vector)
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| returns an iterator to the end (public member function of std::vector)
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| returns a reverse iterator to the beginning (public member function of std::vector)
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| returns a reverse iterator to the end (public member function of std::vector)
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Capacity | |
| checks whether the container is empty (public member function of std::vector)
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| returns the number of elements (public member function of std::vector)
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| returns the maximum possible number of elements (public member function of std::vector)
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| reserves storage (public member function of std::vector)
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| returns the number of elements that can be held in currently allocated storage (public member function of std::vector)
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Modifiers | |
| clears the contents (public member function of std::vector)
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| inserts elements (public member function of std::vector)
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| (since C++14) |
constructs element in-place (public member function of std::vector)
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| erases elements (public member function of std::vector)
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| adds an element to the end (public member function of std::vector)
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| (C++14) |
constructs elements in-place at the end (public member function of std::vector)
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| removes the last element (public member function of std::vector)
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| changes the number of elements stored (public member function of std::vector)
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| swaps the contents (public member function of std::vector)
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| flips all the bits (public member function) | |
| [static] |
swaps two std::vector<bool>::references (public static member function) |
[edit] Non-member functions
| lexicographically compares the values in the vector (function template) | |
| specializes the std::swap algorithm (function template) |
[edit] Helper classes
| (C++11) |
hash support for std::vector<bool> (class template specialization) |
[edit] Notes
If the size of the bitset is known at compile time, std::bitset may be used, which offers a richer set of member functions. In addition, boost::dynamic_bitset exists as an alternative to std::vector<bool>.
Since its representation may by optimized, std::vector<bool> does not necessarily meet all Container or SequenceContainer requirements. For example, because std::vector<bool>::iterator is implementation-defined, it may not satisfy the ForwardIterator requirement. Use of algorithms such as std::search that require ForwardIterators may result in either compile-time or run-time errors.