contains: Check for elements

In cppcontainers: 'C++' Standard Template Library Containers

Check for elements

Description

Check, if elements are part of a container.

Usage

contains(x, values)

Arguments

x	A CppSet, CppUnorderedSet, CppMultiset, CppUnorderedMultiset, CppMap, CppUnorderedMap, CppMultimap, or CppUnorderedMultimap object.
values	Values whose existence to assess. Refers to keys in the case of CppMap, CppUnorderedMap, CppMultimap, and CppUnorderedMultimap objects.

Value

Returns a logical vector of the same length as values, denoting for each value whether it is part of x (TRUE) or not (FALSE).

See Also

[, at, back, front, top.

Examples

s <- cpp_multiset(4:9)
s
# 4 5 6 7 8 9

contains(s, 9:11)
# [1]  TRUE FALSE FALSE

m <- cpp_unordered_map(c("hello", "world"), 3:4)
m
# ["world",4] ["hello",3]

contains(m, c("world", "there"))
# [1]  TRUE FALSE

cppcontainers documentation built on Sept. 9, 2025, 5:55 p.m.