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Better Template Error Messages

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It was a kilobyte long. The same code you'd use to write a regular program, put in the proper place, runs at compile-time instead, and its result gets inserted into the source code of your program. So I think this rule is indispensable in helping to spot problems. The notion had been around in research literature earlier than that, but ML was the first real programming language to have the feature. this content

Request for Comments Those who've read Barton and Nackman's article [1] will immediately see what a huge difference there simple improvements could make for people whose expertise in C++ is not For instance, you could add the following method to the C++ list example above with no problem: template class ListNode { // ... He is responsible for application development using Visual C++, ActiveX technology, Visual SourceSafe, ODBC, and SQL Server. Yes, I have acquired some knowledge of the STL internals over the years, and it is mainly due to the error messages :) Also, when I have no idea what gcc

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Templates are a widely-used C++ feature that have simple behavior with complicated consequences. In this case, the entire error message (from gcc) is: test.cpp: In function ‘void dosomething(T&) [with T = X]’: test.cpp:11: instantiated from here test.cpp:6: error: no match for ‘operator+=’ in ‘x I admit that [kolmogorov-complexity] is a bit of a stretch, but I think it is expressive in this case. –dmckee Apr 4 '11 at 22:04 12 Maybe you should go

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In fact, it is so hard that one of our readers felt obliged to speak out about it. Build Template Error Message Lexmark Uninstall The message was reasonable, if only you could read it. up vote 14 down vote favorite 4 C++ templates are notorious for generating long, unreadable error messages. I don't know the right answer, or whether there is a "right" answer. 2.

The real source of the error messages comes from char baz[i];, which produces an error when i drops to -1. Longest C++ Program edit:: I need to type less to actually get input in time :) share|improve this answer answered Nov 2 '11 at 0:36 septical 41027 add a comment| Your Answer draft clang to create quite decent error message (even if it doesn't implement C++2011, yet; however, no compiler does and as far as I can tell gcc and clang are leading the John Spicer, Edison Design Group The author of the proposal makes some reasonable suggestions about how the compiler's error messages could be improved.

Build Template Error Message Lexmark Uninstall

Reduced by 4 characters :) –BЈовић Jul 1 '11 at 16:33 1 @Rob it includes the same file over and over, and it redefines main every time. –BЈовић Jan 17 Andrei Alexandrescu is a developer with Micro Modeling Associates, Inc.'s New York Component Solutions Group. Build Template Error Message Did you mean a syntax extension? Best Error Messages More detail is available by tailoring the Decryptor's options.] The only downside I can see is that it mislabels the C++ Standard Library. :( Here's a relevant journal article by STLFilt's

Put another way, if you always use the default allocator in STL containers, you'll never see it in any error message. news Is there a way to make a metal sword resistant to lava? but than, Larisse is working on conceptclang and I haven't looked at this, yet: maybe this works better. –Dietmar Kühl Jan 8 '12 at 19:35 1 @Ali: So far I Here, this requires Haskell to act like it instantiates Show x, Show [x], Show [[x]], Show [[[x]]], ad infinitum. C++ Template Error Messages

The presence of the defaults does not help much in understanding the meaning and cause of the error. That means that while you could write a function that took a list of any type and computed its length (because the length of a list doesn't depend on anything about And if you can't deliberately plan and reason about what happens when your system works, why should anyone expect careful, thoughtful planning about what happens when something goes wrong? http://sovidi.com/error-message/better-error-messages.php Browse other questions tagged c++ templates stl or ask your own question.

Are there any tricks to deciphering these errors? Stlfilt C++ Ninjitsu Sunday, December 8, 2013 static_assert: Better template error messages This is one in a series of blog posts covering the effective use of compile-time assertions in C++. But templates have serious drawbacks as well, one of which is the incredibly verbose and dense error messages that are provided should you fail to provide the right kind of parameter

The compiler is only interested in the underlying type, not what the user has chosen to name the type.

Finally, compiler makers are aware of this issue and are gradually improving error message output, so you would do well to stick to the latest version of your compiler. How to deal with a very weak student? Types included in your source code and quoted by the compiler are counted as a single character. C++ Error Message Finally, to address the question about concrete tools: the main "tool" I'm using when I get kind of stuck with a compiler complaining about some template instantiation is to use different

Linked 37 Improving g++ output 22 Deciphering C++ template error messages 9 How to overcome C++'s lack of tool support for embedded systems? This system works well, but unfortunately it requires that every class you want to use declares itself to implement a particular bundle of functionality ahead of time. Cloud Collaboration Tools: Big Hopes, Big Needs Hard Truths about Cloud Differences State of Cloud 2011: Time for Process Maturation SaaS and E-Discovery: Navigating Complex Waters Research: Federal Government Cloud Computing check my blog Here's a good example of an obscure template error: std::vector> foo; std::vector> bar = foo; unique_ptr is not copyable, it can only be moved.

What production quality tools are available to decipher error messages stemming from template-based code? Even better, until concepts (or something approaching them) have been approved, static_assert can fill in the gap rather nicely, as seen in this blog post from Eric Niebler. Small errors explode into pages and pages of unreadable junk. But it is our hope that this article will stir up discussion among compiler users and vendors.

Exactly what is the difference between a type-modifier and a type-qualifier? To upload an avatar photo, first complete your Disqus profile. | View the list of supported HTML tags you can use to style comments. | Please read our commenting policy.