std::map<Key,T,Compare,Allocator>::value_compare - cppreference.com (original) (raw)

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

• 1 Member types
• 2 Protected member objects
• 3 Member functions
• 4 std::map<Key,T,Compare,Alloc>::value_compare::value_compare
  • 4.1 Parameters
• 5 std::map<Key,T,Compare,Alloc>::value_compare::operator()
  • 5.1 Parameters
  • 5.2 Return value
  • 5.3 Exceptions

[edit] Member types

[edit] Protected member objects

| | the stored comparator (protected member object) | | -------------------------------------------------- |

[edit] Member functions

| | constructs a new value_compare object (protected member function) [edit] | | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | | 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

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

Return value

comp(lhs.first, rhs.first)

[edit] Exceptions

May throw implementation-defined exceptions.