operator==,!=,<,<=,>,>=(std::vector)

 

C++

Language

Standard Library Headers

Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical Specifications

 

Containers library

array (C++11)

vector

deque

forward_list (C++11)

list

set

multiset

map

multimap

unordered_set (C++11)

unordered_multiset (C++11)

unordered_map (C++11)

unordered_multimap (C++11)

stack

queue

priority_queue

span (C++20)

 

std::vector

Member functions

vector::vector

vector::~vector

vector::operator=

vector::assign

vector::get_allocator

Element access

vector::at

vector::operator[]

vector::front

vector::back

vector::data (C++11)

Iterators

vector::beginvector::cbegin (C++11)

vector::endvector::cend (C++11)

vector::rbeginvector::crbegin (C++11)

vector::rendvector::crend (C++11)

Capacity

vector::empty

vector::size

vector::max_size

vector::reserve

vector::capacity

vector::shrink_to_fit (C++11)

Modifiers

vector::clear

vector::insert

vector::emplace (C++11)

vector::erase

vector::push_back

vector::emplace_back (C++11)

vector::pop_back

vector::resize

vector::swap

Deduction guides(C++17)

 

template< class T, class Alloc > bool operator==( const std::vector<T,Alloc>& lhs,                  const std::vector<T,Alloc>& rhs );	(1)
template< class T, class Alloc > bool operator!=( const std::vector<T,Alloc>& lhs,                  const std::vector<T,Alloc>& rhs );	(2)
template< class T, class Alloc > bool operator<( const std::vector<T,Alloc>& lhs,                 const std::vector<T,Alloc>& rhs );	(3)
template< class T, class Alloc > bool operator<=( const std::vector<T,Alloc>& lhs,                  const std::vector<T,Alloc>& rhs );	(4)
template< class T, class Alloc > bool operator>( const std::vector<T,Alloc>& lhs,                 const std::vector<T,Alloc>& rhs );	(5)
template< class T, class Alloc > bool operator>=( const std::vector<T,Alloc>& lhs,                  const std::vector<T,Alloc>& rhs );	(6)

Compares the contents of two containers.

1-2) Checks if the contents of lhs and rhs are equal, that is, they have the same number of elements and each element in lhs compares equal with the element in rhs at the same position.

3-6) Compares the contents of lhs and rhs lexicographically. The comparison is performed by a function equivalent to std::lexicographical_compare.

Parameters

lhs, rhs	-	containers whose contents to compare
- T must meet the requirements of EqualityComparable in order to use overloads (1-2).
- T must meet the requirements of LessThanComparable in order to use overloads (3-6). The ordering relation must establish total order.

Return value

1) true if the contents of the containers are equal, false otherwise

2) true if the contents of the containers are not equal, false otherwise

3) true if the contents of the lhs are lexicographically less than the contents of rhs, false otherwise

4) true if the contents of the lhs are lexicographically less than or equal the contents of rhs, false otherwise

5) true if the contents of the lhs are lexicographically greater than the contents of rhs, false otherwise

6) true if the contents of the lhs are lexicographically greater than or equal the contents of rhs, false otherwise

Complexity

1-2) Constant if lhs and rhs are of different size, otherwise linear in the size of the container

3-6) Linear in the size of the container