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std::map::value_compare

From cppreference.com
< cpp‎ | container‎ | map
class value_compare;

std::map::value_compare is a function object that compares objects of type std::map::value_type (key-value pairs) by comparing of the first components of the pairs.

Contents

[edit] Member types

Type Definition
result_type bool
first_argument_type value_type
second_argument_type value_type

[edit] Protected member objects

Name Type
comp Compare

[edit] Member functions

(constructor)
constructs a new value_compare object
(protected member function) [edit]
operator()
compares two values of type value_type
(public member function) [edit]

std::map<Key,T,Compare,Alloc>::value_compare::value_compare

protected:
value_compare( Compare c );

Initializes the internal instance of the comparator to c.

Parameters

c - comparator to assign

std::map<Key,T,Compare,Alloc>::value_compare::operator()

bool operator()( const value_type& lhs, const value_type& rhs ) const;

Compares lhs.first and rhs.first by calling the stored comparator.

Parameters

lhs, rhs - values to compare

Return value

comp(lhs.first, rhs.first).

Exceptions

(none)