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C++ Map Library - value_comp() Function
Description
The C++ function std::map::value_comp() returns a function object that compares objects of type std::map::value_type.
Declaration
Following is the declaration for std::map::value_comp() function form std::map header.
C++98
value_compare value_comp() const;
Parameters
None
Return value
Returns a value comparison function object.
Exceptions
This member function doesn't throw exception.
Time complexity
Constant i.e. O(1)
Example
The following example shows the usage of std::map::value_comp() function.
#include <iostream> #include <map> using namespace std; int main(void) { /* Initializer_list constructor */ map<char, int> m = { {'a', 1}, {'b', 2}, {'c', 3}, {'d', 4}, {'e', 5}, }; auto last = *m.rbegin(); auto it = m.begin(); cout << "Map contains following elements" << endl; do cout << it->first << " = " << it->second << endl; while (m.value_comp()(*it++, last)); return 0; }
Let us compile and run the above program, this will produce the following result −
Map contains following elements a = 1 b = 2 c = 3 d = 4 e = 5
map.htm
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