print all the longest words in the file, C++ (vc++)

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//Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x64

#include <iostream>
#include <string>
#include <fstream>

int main()
{
    const std::string input_file_path = __FILE__ ; // "word_list.txt" ;

if( std::ifstream in_file{ input_file_path } ) // if the file was opened for input
    {
        std::string longest_words ;
        std::size_t longest_word_size = 0 ;

// test cases: oversimplification conversationalists disenfranchisement

std::string word ;
        while( in_file >> word )
        {
            if( word.size() > longest_word_size )
            {
                longest_words = word ; // replace 
                longest_word_size = word.size() ;
            }
            
            else if( word.size() == longest_word_size ) longest_words += '\n' + word ; // append after a new line
        }

// print all the longest words
        std::cout << "longest word(s) in the file " << input_file_path << ":\n-------"
                  << "----------\n" << longest_words << '\n' ;
    }

// test cases: characteristically transcendentalists telecommunications 
    //             disproportionately institutionalising misrepresentations

else std::cout << "error: failed to open input file " << input_file_path << '\n' ;
}

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Compilation time: 1,88 sec, absolute running time: 0,21 sec, absolute service time: 2,11 sec