On 3/12/2026 10:13 AM, Bonita Montero wrote:If that isn't self-explanatory stick with C.Here, do that in C:Explain in detail what it does.
>
static optional<size_t> parse( const char *str )
{
size_t ret;
if( from_chars_result fcr = from_chars( str, str + strlen( str ), ret ); (bool)fcr.ec || *fcr.ptr )
return nullopt;
return ret;
}
I've got a task for you: Do the same in C:
#include <iostream>
#include <regex>
#include <fstream>
#include <vector>
#include <algorithm>
#include <vector>
using namespace std;
int main( int argc, char **argv )
{
if( argc < 2 )
return EXIT_FAILURE;
ifstream ifs( argv[1] );
static regex rxNameTel( "^\s*\"([^\"]*)\"\s*\"([^\"]*)\"\s*$" );
struct name_tel { string name, tel; };
vector<name_tel> phoneList;
while( !ifs.eof() )
{
string line;
getline( ifs, line );
match_results<string::const_iterator> sm;
if( regex_match( line, sm, rxNameTel ) )
phoneList.emplace_back( string( sm[1].first, sm[1].second ), string( sm[2].first, sm[2].second ) );
}
sort( phoneList.begin(), phoneList.end(),
[]( const name_tel &left, const name_tel &right ) { return left.name < right.name; } );
for( name_tel &phone : phoneList )
cout << "\"" << phone.name << "\"\t\"" << phone.tel << "\"" << endl;
}
1. Read a file and parse it with ne mentioned regex-pattern.
2. Split both parts of every line in two strings.
3. Sort the "vector" according to the first string.
4. Print it.
I guess you don't manage to do that with less than five times the work.
Every external lib allowed.
| Date | Sujet | # | Auteur | |
| 12 Mar 26 |  Re: Isn't that beauty ? (no it's not) | 8 | Bonita Montero | |
| 12 Mar 26 |   Re: Isn't that beauty ? (no it's not) | 1 | Bonita Montero | |
| 13 Mar 26 | Re: Isn't that beauty ? (no it's not) | 2 | Bonita Montero | |
| 13 Mar 26 |   Re: Isn't that beauty ? (no it's not) | 1 | Chris M. Thomasson | |
| 13 Mar 26 | Re: Isn't that beauty ? (no it's not) | 1 | Bonita Montero | |
| 13 Mar 26 | Re: Isn't that beauty ? (no it's not) | 3 | Bonita Montero | |
| 14 Mar 26 |  Re: Isn't that beauty ? (no it's not) | 2 | Bonita Montero | |
| 14 Mar 26 | Re: Isn't that beauty ? (no it's not) | 1 | Bonita Montero |
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