std::map::value_compare(3)

💅 std::map::value_compare 💅

Okay bestie, welcome to the C++ Standard Libary manual page for std::map::value_compare — yes, it's giving very specific function-object couture, and we're getting into it. 💖

🌸 NAME 🌸

std::map::value_compare — std::map::value_compare

✨ Synopsis ✨

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 the first components of the pairs.

🎀 Member types 🎀

Type → Definition, bestie:

• result_type — bool (deprecated in C++17)(removed in C++20)
• first_argument_type — value_type (deprecated in C++17)(removed in C++20)
• second_argument_type — value_type (deprecated in C++17)(removed in C++20)

These member types are obtained via publicly inheriting (until C++11) std::binary_function<value_type, value_type, bool>.

🧚 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 💀

May throw implementation-defined exceptions.

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That's the whole page, bestie — mwah 💋. Source: http://cppreference.com · version/date: 2024.06.10.