operator< (set) (STL/CLR)

Article
06/05/2017

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

List less than comparison.

Syntax

template<typename Key>  
    bool operator<(set<Key>% left,  
        set<Key>% 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 sets are compared element by element.

Example

// cliext_set_operator_lt.cpp   
// compile with: /clr   
#include <cliext/set>   
  
typedef cliext::set<wchar_t> Myset;   
int main()   
    {   
    Myset c1;   
    c1.insert(L'a');   
    c1.insert(L'b');   
    c1.insert(L'c');   
  
// display contents " a b c"   
    for each (wchar_t elem in c1)   
        System::Console::Write(" {0}", elem);   
    System::Console::WriteLine();   
  
// assign to a new container   
    Myset c2;   
    c2.insert(L'a');   
    c2.insert(L'b');   
    c2.insert(L'd');   
  
// display contents " a b d"   
    for each (wchar_t elem in c2)   
        System::Console::Write(" {0}", elem);   
    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 b c  
 a b d  
[a b c] < [a b c] is False  
[a b c] < [a b d] is True

Requirements

Header: <cliext/set>

Namespace: cliext

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