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Eric Beyeler
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 Posted: Thu Jul 15, 2004 11:53 pm Post subject: testing for compile-ability |
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Is there any way with TMP or otherwise, to catch what would otherwise
be a compile error, and wrap it so it does not produce the error?
I am thinking in relation to unit tests, where a certain construct
should fail to compile, but testing for that failure prevents the test
suite from compiling and hence running. (I am writing a strong_typedef
template )
Eric B
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David Abrahams
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| Posted: Fri Jul 16, 2004 11:06 am Post subject: Re: testing for compile-ability |
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[email]ebeyeler_g (AT) yahoo (DOT) com[/email] (Eric Beyeler) writes:
| Quote: | Is there any way with TMP or otherwise, to catch what would otherwise
be a compile error, and wrap it so it does not produce the error?
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Not at the language level.
| Quote: | I am thinking in relation to unit tests, where a certain construct
should fail to compile, but testing for that failure prevents the test
suite from compiling and hence running. (I am writing a strong_typedef
template )
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The Boost build/test system includes "expected compilation failure"
tests for this purpose.
--
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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Michiel Salters
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| Posted: Fri Jul 16, 2004 1:59 pm Post subject: Re: testing for compile-ability |
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[email]ebeyeler_g (AT) yahoo (DOT) com[/email] (Eric Beyeler) wrote in message news:<8cfd9620.0407150446.1065b407 (AT) posting (DOT) google.com>...
| Quote: | Is there any way with TMP or otherwise, to catch what would otherwise
be a compile error, and wrap it so it does not produce the error?
I am thinking in relation to unit tests, where a certain construct
should fail to compile, but testing for that failure prevents the test
suite from compiling and hence running. (I am writing a strong_typedef
template )
|
Not in general, but SFINAE will allow a number of checks.
It cannot be used to check if a sequence of tokens can compile at all,
but it can be used to check if a syntactically valid template is
compilable for a certain set of parameters.
However, this is irrelevant for unit tests in C++. C++ has UB, which
must be handled from outside C++ anyway. On the outside, the test
fails if it doesn't run to completion, whether by measured failure,
UB or failure to compile.
Regards,
Michiel Salters
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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Pete Becker
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| Posted: Sat Jul 17, 2004 10:00 am Post subject: Re: testing for compile-ability |
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Eric Beyeler wrote:
| Quote: |
Is there any way with TMP or otherwise, to catch what would otherwise
be a compile error, and wrap it so it does not produce the error?
I am thinking in relation to unit tests, where a certain construct
should fail to compile, but testing for that failure prevents the test
suite from compiling and hence running. (I am writing a strong_typedef
template )
|
This is what's known as a "negative test". You write one per source
file. If it compiles the test has succeeded (that is, it found an
error).
--
Pete Becker
Dinkumware, Ltd. (http://www.dinkumware.com)
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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