C++ Programming Code Examples
C++ > Visual C++ 5.0 Standard C++ Library Code Examples
Deque operatorgteq - Returns true if !(d1 < d2).
Deque operatorgteq - Returns true if !(d1 < d2).
operator>=
Header
<deque>
template<class T, class A>
bool operator>=(const deque<T, A>&d1, const deque<T, A>&d2) ;
Returns true if !(d1 < d2).
Sample
#include <deque>
#include <iostream>
int main()
{
std::deque<int> c1, c2, c3, c4 ;
int i ;
for (i = 0; i < 10; i++)
{
c1.push_back(i) ;
c2.push_back(i*i) ;
c3.push_back(i*i*i) ;
c4.push_back(i) ;
}
if (c1 == c4)
std::cout << "c1 == c4" << std::endl ;
if (c2 != c3)
std::cout << "c2 != c3" << std::endl ;
if(c2 < c3)
std::cout << "c2 < c3" << std::endl ;
if(c3 > c2)
std::cout << "c3 > c2" << std::endl ;
c4.push_back(29) ;
if (c1 <= c4)
std::cout << "after c4.push_back(29), c1 <= c4" << std::endl ;
if (c3 >= c2)
std::cout << "c3 >= c2" << std::endl ;
std::swap(c3, c2) ;
std::cout << "after swapping c3 with c2, " ;
if (c3 >= c2)
std::cout << "c3 >= c2" << std::endl ;
else
std::cout << "c3 < c2" << std::endl ;
return 0 ;
}
Program Output
c1 == c4
c2 != c3
c2 < c3
c3 > c2
after c4.push_back(29), c1 <= c4
c3 >= c2
after swapping c3 with c2, c3 < c2
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deque (usually pronounced like "deck") is an irregular acronym of double-ended queue. Double-ended queues are sequence containers with dynamic sizes that can be expanded or contracted on both ends (either its front or its back). Specific libraries may implement deques in different ways, generally as some form of dynamic array. But in any case, they allow for the individual elements to be accessed directly through random access iterators, with storage handled automatically by expanding and contracting the container as needed. Therefore, they provide a functionality similar to vectors, but with efficient insertion and deletion of elements also at the beginning of the sequence, and not only at its end. But, unlike vectors, deques are not guaranteed to store all its elements in contiguous storage locations: accessing elements in a deque by offsetting a pointer to another element causes undefined behavior.
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Relational operators for deque. Performs the appropriate comparison operation between the deque containers lhs and rhs. The equality comparison (operator==) is performed by first comparing sizes, and if they match, the elements are compared sequentially using operator==, stopping at the first mismatch (as if using algorithm equal). The less-than comparison (operator<) behaves as if using algorithm lexicographical_compare, which compares the elements sequentially using operator< in a reciprocal manner (i.e., checking both a<b and b<a) and stopping at the first occurrence. Function returns true if the condition holds, and false otherwise.
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Add element at the end. Adds a new element at the end of the deque container, after its current last element. The content of val is copied (or moved) to the new element. This effectively increases the container size by one. push_back() function is used to push elements into a deque from the back. The new value is inserted into the deque at the end, before the current last element and the container size is increased by 1. This function does not return any value.
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