Saturday, June 13, 2015

Digest for comp.lang.c++@googlegroups.com - 13 updates in 3 topics

Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk>: Jun 13 08:24PM +0100

On 13/06/2015 20:18, Luca Risolia wrote:
 
> Then what you are saying does not make any sense.
 
> Why should the language provide a way to write:
 
> auto i = 42s32;
 
The language already does provide a way in the form of UDLs. I am
proposing that the following UDLs be added to the C++ Standard Library:
 
s8, s16, s32, s64, u8, u16, u32, u64.
 
 
> if you can already safely initialize i with:
 
> std::int32_t i{42};
 
> The compiler will produce a diagnostic on narrowing conversions.
 
Yes the current situation of relying on compiler diagnostics or worse
relying on unsafe non-portable code is so much better. </sarcasm>
 
/Flibble
woodbrian77@gmail.com: Jun 13 12:56PM -0700

On Saturday, June 13, 2015 at 1:05:37 PM UTC-5, Mr Flibble wrote:
> means that code runs *correctly* as-is on all platforms for which it
> compiles.
 
> /Flibble
 
I want my software to compile and run on as many platforms as
possible.
 
If you see any portability problems here, please let me know.
I've tested it on PC-BSD, Linux and Windows and not found any
problems.
 
#include "platforms.hh"
 
#include "ErrorWords.hh"
#include "getaddrinfo_wrapper.hh"
#include "poll_wrapper.hh"
#include "ReceiveBufferStack.hh"
#include "SendBufferStack.hh"
#include <stdio.h>
#include <stdlib.h> // exit
#include "syslog_wrapper.hh"
#include "zz.front_messages_middle.hh"
 
using namespace ::cmw;
 
int main (int argc,char** argv)
{
try{
if(argc<3 || argc>5)
throw failure("Usage: direct account-number .req-file-path [node] [port]");
 
windows_start();
getaddrinfo_wrapper res(3==argc?"::1"/*"127.0.0.1"*/:argv[3]
,argc<5?"55555":argv[4],SOCK_DGRAM);
auto rp=res.get();
SendBufferStack<> sendbuf;
for(;rp!=nullptr;rp=rp->ai_next){
if((sendbuf.sock_=::socket(rp->ai_family,rp->ai_socktype,0))>0)break;
}
if(-1==sendbuf.sock_)throw failure("socket call(s) failed ")<<GetError();
 
::pollfd pfd{sendbuf.sock_,POLLIN,0};
int waitMillisecs=30000;
for(int j=0;j<2;++j,waitMillisecs*=2){
front_messages_middle::Marshal(sendbuf,marshalling_integer(argv[1])
,argv[2]);
sendbuf.Flush(rp->ai_addr,rp->ai_addrlen);
if(poll_wrapper(&pfd,1,waitMillisecs)>0){
ReceiveBufferStack<SameFormat> buf(pfd.fd);
if(!buf.GiveBool())throw failure("CMWA: ")<<buf.GiveCharStar();
::exit(EXIT_SUCCESS);
}
}
throw failure("No reply received. Is the middle tier (CMWA) running?");
}catch(::std::exception const& ex){
::printf("%s: %s\n",argv[0],ex.what());
#ifndef CMW_WINDOWS
::openlog(argv[0],LOG_NDELAY,LOG_USER);
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