std::{{{1}}}::value_compare
From cppreference.com
| class value_compare; |
(since {std}) | |
std::{{{1}}}::value_compare is a function object that compares objects of type std::{{{1}}}::value_type (key-value pairs) by comparing of the first components of the pairs.
Contents |
[edit] Member types
| Type | Definition |
result_type (deprecated in C++17)(removed in C++20)
|
bool |
first_argument_type (deprecated in C++17)(removed in C++20)
|
value_type
|
second_argument_type (deprecated in C++17)(removed in C++20)
|
value_type
|
|
These member types are obtained via publicly inheriting std::binary_function<value_type, value_type, bool>. |
(until C++11) |
[edit] Protected member objects
| Compare comp |
the stored comparator (protected member object) |
[edit] Member functions
constructs a new value_compare object (protected member function) | |
compares two values of type value_type (public member function) |
std::<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::<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)
[edit] Exceptions
May throw implementation-defined exceptions.
