#include <string>
#include <iostream>
using std::cout;
using std::endl;
void FunctionThatMod ifies(std::stri ng &a)
{
a = "You've been modified.";
}
int main()
{
std::string const a("Untouchable. ");
std::string &b = a; //Actually compiles with error!
FunctionThatMod ifies(b);
std::cout << b;
}
Compiler gives me a warning. I think it should give me a downright error,
and I want it to give me a downright error.
Firstly, does the Standard say whether this should generate a warning or
an error?
Secondly, do compilers have an option whereby you can make it give an
error? If so, I'll be using it.
-Tomás
Mar 4 '06
50  2689 
* Pete Becker: Tomás wrote:
Compiler gives me a warning. I think it should give me a downright
error, and I want it to give me a downright error.
Firstly, does the Standard say whether this should generate a warning
or an error?
It requires "a diagnostic." The standard doesn't talk about warnings and
errors.
It really does.
The 1998 C++ standard contains 135 instances of "error" being used as a
synonym for "ill-formed".
It also contains 1 usage of "warning", exemplifying that that is a term
it is assumed that readers of the standard should understand.
--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?
"Default User" <de***********@ yahoo.com> wrote in message
news:47******** ****@individual .net... Joe Van Dyk wrote:
On Sun, 05 Mar 2006 09:37:52 -0500, Pete Becker wrote:
> Alf P. Steinbach wrote:
>
>
>>
>>> Firstly, does the Standard say whether this should generate a
warning >>> or an error? >>
>>
>> An error.
>>
>
> The Standard requires "a diagnostic." It does not specify the form
> or the consequences of that diagnostic, and it does not distinguish
> between a "warning" and an "error."
What is "a diagnostic"?
From the standard, under Terms and definitions:
1.3.2 diagnostic message
a message belonging to an implementation-defined subset of the
implementation' s output messages.
Umm.. if I'm reading htat right, it basically says that a diagnostic message
is an output message. Not exactly specific is it?
* Jim Langston: * "Default User":
1.3.2 diagnostic message
a message belonging to an implementation-defined subset of the
implementation' s output messages.
Umm.. if I'm reading htat right, it basically says that a diagnostic message
is an output message. Not exactly specific is it?
"diagnostic " isn't the part being defined, you're assumed to understand
what "diagnostic " means. What's defined, in a badly worded way, is that
a compiler ("translator " in the standard's terminology) is allowed to
output other messages than those corresponding to "requires a
diagnostic", including non-diagnostic messages. If you go the route of
trying to find definitions of common-sense terms you won't find a
definition of "translator " either, although the term is used.
--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?
Alf P. Steinbach wrote:
Just to repeat: the standard's official term corresponding to "error", a
program that does not compile, is not "diagnostic ", it is "ill-formed"
The standard does not require that anything not compile. An ill-formed
program requires a diagnostic. Nothing more.
--
Pete Becker
Roundhouse Consulting, Ltd.
Alf P. Steinbach wrote: * Pete Becker:
Tomás wrote:
Compiler gives me a warning. I think it should give me a downright
error, and I want it to give me a downright error.
Firstly, does the Standard say whether this should generate a warning
or an error?
It requires "a diagnostic." The standard doesn't talk about warnings
and errors.
It really does.
The 1998 C++ standard contains 135 instances of "error" being used as a
synonym for "ill-formed".
Nevertheless, it does not require "a warning" nor "an error" (not even
"a downright error") as used in the original message. Context matters.
It also contains 1 usage of "warning", exemplifying that that is a term
it is assumed that readers of the standard should understand.
The standard does not require "error" messages nor "warnings". It does
not require that anything not compile. The only requirement on
ill-formed programs is that the compiler issue a diagnostic.
--
Pete Becker
Roundhouse Consulting, Ltd.
Jim Langston wrote:
Umm.. if I'm reading htat right, it basically says that a diagnostic message
is an output message. Not exactly specific is it?
Nope. Could be text, could be beeps from the speaker, could be flashing
the screen. It's up to the implementation.
--
Pete Becker
Roundhouse Consulting, Ltd.
"Alf P. Steinbach" <al***@start.no > skrev i meddelandet
news:47******** ****@individual .net...
"Error" and "warning" are however not terms _defined_ by the
standard. They are terms used by actual compilers. "Error" means
the program does not compile, and "warning" means that at least that
part of it compiles, but with some probably dubious construct that
may not do what you intended.
There is no requirement to compile the program, it could be
interpreted. :-)
Just to repeat: the standard's official term corresponding to
"error", a program that does not compile, is not "diagnostic ", it is
"ill-formed"
Even if there is an "error" the translator can issue its diagnostic
(required), see that it was an obvious typo, and then continue with
the translation.
Bo Persson
osmium wrote: "Default User" writes:
What is "a diagnostic"?
From the standard, under Terms and definitions:
1.3.2 diagnostic message
a message belonging to an implementation-defined subset of the
implementation' s output messages.
There must be a word for that. You actually know less after reading
the definition than you did before you read it!
Actually, it lets you know you all you're going to be able to tell
about it. A diagnostic is an output message. It's
implementation-defined, which means that the implementation must
document the messages. That's all you can count on. There's no talk of
"warnings" or "errors", no indication that compilation must continue or
stop.
Brian
Jim Langston wrote: "Default User" <de***********@ yahoo.com> wrote in message
news:47******** ****@individual .net... Joe Van Dyk wrote:
What is "a diagnostic"?
From the standard, under Terms and definitions:
1.3.2 diagnostic message
a message belonging to an implementation-defined subset of the
implementation' s output messages.
Umm.. if I'm reading htat right, it basically says that a diagnostic
message is an output message. Not exactly specific is it?
The key is that it is implementation-defined. The implementation is
required to document the diagostics. Of course, that doesn't mean that
they have to be meaningful (and we've all seen some pretty obscure or
misleading messages). Printing, "your code sucks and so do you" for
every diagnostic would be perfectly within the standard.
Brian
* Pete Becker: Alf P. Steinbach wrote:
Just to repeat: the standard's official term corresponding to "error",
a program that does not compile, is not "diagnostic ", it is "ill-formed"
The standard does not require that anything not compile. An ill-formed
program requires a diagnostic. Nothing more.
That is correct, at last.
--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
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