Thursday, June 7, 2018

Digest for comp.lang.c++@googlegroups.com - 12 updates in 4 topics

wyniijj@gmail.com: Jun 06 09:13PM -0700

Alf P. Steinbach於 2018年6月6日星期三 UTC+8下午9時34分20秒寫道：
 
> <url: http://wiki.c2.com/?ThreeStarProgrammer>
 
> Cheers!,
 
> - Alf
 
Basically I use '()' and typedef to avoid such kind of ambiguity.
 
I have a templete class Wy_AtDestroy in my library.
https://sourceforge.net/projects/cscall/
It's written from eraly days since learning C++, not modified till
now, since I still have no idea how. Probably, a language specialist
as you are can shade some light.
Paavo Helde <myfirstname@osa.pri.ee>: Jun 07 09:02AM +0300

On 6.06.2018 16:34, Alf P. Steinbach wrote:
 
> Eventually you'll advance to three star programmer level, and these
> early problems will seem trivial.
 
> <url: http://wiki.c2.com/?ThreeStarProgrammer>
 
Three stars? Are you kidding? I have seen five stars in the code of a
coworker (who was desperately trying to figure out why his
five-times-nested loops were so slow).
"Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com>: Jun 07 01:30PM +0200

> It's written from eraly days since learning C++, not modified till
> now, since I still have no idea how. Probably, a language specialist
> as you are can shade some light.
 
It all depends on what the code is for, which is not evident.
 
E.g. if the pointer is meant to point to a dynamic size array, use
`std::vector`.
 
 
Cheers!,
 
- Alf
wyniijj@gmail.com: Jun 07 05:24AM -0700

Alf P. Steinbach於 2018年6月7日星期四 UTC+8下午7時30分50秒寫道：
> `std::vector`.
 
> Cheers!,
 
> - Alf
 
The question was from trying wrapping clib function getaddrinfo(2)
I changed my mind to use class (see CSCall/AddrInfo.h). As always,
nearly all the classes in the library expose what's wrapped,
explicitly violating C++ data encapsulation principle.
 
E.g. WyArray(std::vector), WyStr(std::string)
 
The fact past have been showing 'good'(not bad) to me, I don't
know why? Even we all admit data encapsulation is good!
"Alf P. Steinbach" <alf.p.steinbach+usenet@gmail.com>: Jun 07 10:49PM +0200


>> Cheers!,
 
>> - Alf
 
> The question was from trying wrapping clib function getaddrinfo(2)
 
Like this:
 
------------------------------------------------------------------------------
// Source encoding: utf-8
// MinGW g++ build: "g++ main.cpp -std=c++17 -lws2_32 -lntdll"
 
#include <stdlib/all/basics.hpp> //
https://github.com/alf-p-steinbach/Wrapped-stdlib
using namespace stdlib::ext::hopefully_and_fail; // hopefully, fail
using namespace stdlib::ext::type_builders; // ptr_, ref_
 
#include <winsock2.h>
#include <ws2tcpip.h> // getaddrinfo, inet_ntop
 
// Goal: to wrap
//
// int WSAAPI getaddrinfo(
// ptr_<char const> pNodeName,
// ptr_<char const> pServiceName,
// ptr_<const addrinfo> pHints,
// ptr_<ptr<addrinfo>> ppResult
// );
 
#if defined( __GNUC__ ) and not defined( NO_INET_NTOP_FIX )
inline auto inet_ntop(
const int family,
const ptr_<const in6_addr> address,
const ptr_<char> buffer,
const socklen_t buffer_size
)
{
assert( family == AF_INET6 ); (void) family;
assert( buffer_size >= INET6_ADDRSTRLEN ); (void) buffer_size;
RtlIpv6AddressToStringA( address, buffer );
return buffer;
}
Posted by at

No comments:

Post a Comment

Subscribe to: Post Comments (Atom)