Observers

Method
Multimap
Returns the function that compares keys
key_compare key_comp() const noexcept;
Returns the function that compares keys in objects of type value_type
value_compare value_comp() const noexcept
SpatialMap
Returns the function that compares keys in a single dimension
dimension_compare dimension_comp() const noexcept;

Return value

A callable function that compares dimensions, keys, or values.

Complexity

\[ O(1) \]

Notes

These functions return copies of the container's constructor argument comp, or a wrappers around these copies.

Example

C++

auto fn = pf.dimension_comp();
if (fn(2.,3.)) {
    std::cout << "2 is less than 3" << std::endl;
} else {
    std::cout << "2 is not less than 3" << std::endl;
}

Output

2 is less than 3