operator< (map) (STL/CLR)

Article
06/05/2017

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The latest version of this topic can be found at operator< (map) (STL/CLR).

List less than comparison.

Syntax

template<typename Key,  
    typename Mapped>  
    bool operator<(map<Key, Mapped>% left,  
        map<Key, Mapped>% right);

Parameters

left
Left container to compare.

right
Right container to compare.

Remarks

The operator function returns true if, for the lowest position i for which !(``right``[i] < left``[i]) it is also true that left``[i] < right``[i]. Otherwise, it returns left``->size() < right``->size() You use it to test whether left is ordered before right when the two maps are compared element by element.

Example

// cliext_map_operator_lt.cpp   
// compile with: /clr   
#include <cliext/map>   
  
typedef cliext::map<wchar_t, int> Mymap;   
int main()   
    {   
    Mymap c1;   
    c1.insert(Mymap::make_value(L'a', 1));   
    c1.insert(Mymap::make_value(L'b', 2));   
    c1.insert(Mymap::make_value(L'c', 3));   
  
// display contents " [a 1] [b 2] [c 3]"   
    for each (Mymap::value_type elem in c1)   
        System::Console::Write(" [{0} {1}]", elem->first, elem->second);   
    System::Console::WriteLine();   
  
// assign to a new container   
    Mymap c2;   
    c2.insert(Mymap::make_value(L'a', 1));   
    c2.insert(Mymap::make_value(L'b', 2));   
    c2.insert(Mymap::make_value(L'd', 4));   
  
// display contents " [a 1] [b 2] [d 4]"   
    for each (Mymap::value_type elem in c2)   
        System::Console::Write(" [{0} {1}]", elem->first, elem->second);   
    System::Console::WriteLine();   
  
    System::Console::WriteLine("[a b c] < [a b c] is {0}",   
        c1 < c1);   
    System::Console::WriteLine("[a b c] < [a b d] is {0}",   
        c1 < c2);   
    return (0);   
    }

 [a 1] [b 2] [c 3]  
 [a 1] [b 2] [d 4]  
[a b c] < [a b c] is False  
[a b c] < [a b d] is True

Requirements

Header: <cliext/map>

Namespace: cliext

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