std_minmax_unexpected_behaviour.cpp, C++ (gcc)

std_minmax_unexpected_behaviour.cpp

#include <cassert>

#include <algorithm>
#include <iostream>
#include <vector>

void testminmax_with_subtraction_expression()
{
    std::pair<int, int> pair = std::minmax(3, 5 - 3);
    assert(pair.first == 2);
    assert(pair.second == 3);
}

void testminmax_with_addition_expression()
{
    std::pair<int, int> pair = std::minmax(3, 5 + 3);
    assert(pair.first == 3);
    assert(pair.second == 8);
}

void testminmax_with_subtraction_expression_assign_to_second_var()
{
    std::pair<int, int> pair = std::minmax(5, 3);
    // The below call to minmax is equivalent to that in testminmax_with_subtraction_expression
    std::pair<int, int> pair2 = std::minmax(pair.first, pair.second - pair.first);
    assert(pair2.first == 2);
    assert(pair2.second == 3);
}

void testminmax_with_addition_expression_assign_to_second_var()
{
    std::pair<int, int> pair = std::minmax(5, 3);
    // The below call to minmax is equivalent to that in testminmax_with_addition_expression
    std::pair<int, int> pair2 = std::minmax(pair.first, pair.second + pair.first);
    assert(pair2.first == 3);
    assert(pair2.second == 8);
}

void testminmax_with_subtraction_expression_assign_to_same_var()
{
    std::pair<int, int> pair = std::minmax(5, 3);
    // The below call to minmax is equivalent to that in testminmax_with_subtraction_expression
    pair = std::minmax(pair.first, pair.second - pair.first);
    assert(pair.first == 2);
    assert(pair.second == 3);
}

void testminmax_with_addition_expression_assign_to_same_var()
{
    std::pair<int, int> pair = std::minmax(5, 3);
    // The below call to minmax is equivalent to that in testminmax_with_addition_expression
    pair = std::minmax(pair.first, pair.second + pair.first);
    assert(pair.first == 3);
    assert(pair.second == 8);
}

int main()
{
        testminmax_with_subtraction_expression();
 
        testminmax_with_addition_expression();
 
        testminmax_with_subtraction_expression_assign_to_second_var();
 
        testminmax_with_addition_expression_assign_to_second_var();
 
        testminmax_with_subtraction_expression_assign_to_same_var(); // This function will fail
 
        testminmax_with_addition_expression_assign_to_same_var();
}


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