std::map<Key,T,Compare,Allocator>::value_compare
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.
Member types
| (until C++20) |
Protected member objects
| Compare comp | the stored comparator (protected member object) |
Member functions
| (constructor) | constructs a new value_compare object (protected member function) |
| operator() | compares two values of type value_type (public member function) |
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).
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