I have some very simple code fragment:
short int n1, n2;
....
n1 += n2;
I get an warning from VS2003 - VS2005: warning C4244: '+=' : conversion
from 'int' to 'short', possible loss of data
n1 = n1 + n2;
Here I don't get the warning. Strange...
I'm using warning level 4. Is this "VC++ specific" or conformant to the
standard?
Greets
--
Henryk
Feb 7 '06
11  1770 
Henryk wrote: [..]
Btw, is there a good online source for the C++ Standard? I just
downloaded a pdf from open-std.org but it seems not up-to-date (its
from 2001).
Please look in the FAQ.
V
--
Please remove capital As from my address when replying by mail
Victor Bazarov escreveu: Marcelo Pinto wrote:
But the fourth bullet directs to 4.5, and 4.5/1 reads:
"An rvalue of type char, signed char, unsigned char, short int, or
unsigned short int **can** be converted to an rvalue of type int if int
can represent all the values of the source type; otherwise, the source
rvalue **can** be converted to an rvalue of type unsigned int."
(the ** are mine)
As I interpret it, it is not *required* it is a possibility. Please,
correct me if I am wrong.
Subclause 4.5 shows _how_ it's done *if* it's done. 5/9 requires that it
_shall_ be done. Read it again.
V
--
Yes, I see it now, thank you.
Marcelo Pinto This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
by: victor75040 |
last post by:
Before you all start flaming me, I am not a student and this is not
for any homework. Just someone learing c++ on their own.
I am now up to the chapter in my book that describes operator
overloading.
I just cannot find any explanation that clearly point out what the
parts of the statement refer to. For example the book says:
comp operator+(comp b)
|
by: cppaddict |
last post by:
Hi,
Is it considered bad form to have the subscript operator return a
const reference variable? If not, what is the proper way to do it?
My question was prompted by the code below, my problematic attempt to
implement a subscript operator that returns a const reference. The
dubious code is marked at the end.
<code>
|
by: Glen Herrmannsfeldt |
last post by:
I was compiling a program written by someone else about six years ago, and
widely distributed at the time. It also includes makefiles for many
different systems, so I know it has been compiled with many different
compilers.
I got compile errors when it used va_arg to fetch an argument of type short.
That seemed a little strange to me, so I changed it to int and it compiled
just fine.
So now I wonder, just what is the rule for va_arg...
|
by: NilsNilsson |
last post by:
I wrote this:
short s1 = 0;
short s2 = 1;
short s3 = s1 + s2;
And gor this compile error message: Cannot implicitly convert type 'int' to
'short'
What is wrong here?
|
by: seb666fr2 |
last post by:
hello,
Anybody can tell me why it is impossible to use the '&' operator
with operands of type 'long' or 'ulong' and what i must use instead
of this?
thanks.
| | |
by: cody |
last post by:
Why can I overload operator== and operator!= separately having different
implementations and additionally I can override equals() also having a
different implementation.
Why not forbid overloading of == and != but instead translate each call
of objA==objB automatically in System.Object.Equals(objA, objB).
This would remove inconsistencies like
myString1==myString2
|
by: Norman Diamond |
last post by:
In an antique obsolete version of MFC, a CString expression could be
subscripted in order to retrieve one element.
Visual Studio 2005 defines CSimpleStringT::operator. At first glance it
looks like it might have been intended to provide backwards compatibility
for antique programs. But there seems to be no way to use it.
CString s = _T("ab");
short i = 1;
_TCHAR c = s;
|
by: email7373388 |
last post by:
I'm working on a program which has a strange operator, :>. This is
the syntax:
((unsigned short)( var1)):>((void __near *)( var2 ))
Any clue?
|
by: Thomas Lenz |
last post by:
The code below should allow to use a comma instead of << with ostreams and
include a space between two operands when comma is used. e.g.
cout << "hello", "world", endl;
should print the line "hello world".
#include <iostream>
using namespace std;
|
by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
|
by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
| | |
by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
|
by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
|
by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
|
by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
|
by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
|
by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
| | |
by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
| |
