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Better Template Error Messages


Telling the user about types he writes rather than expanding all typedefs as the compiler like to see at the lowest level also helps. 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. C++ is a great language. 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++. this content

While the standard of compiler error messages has slowly improved over the years (at least we have got away from the overused "syntax error") there is still much room for improvement. That system allows a programmer to declare a certain bundle of method signatures apart from any class and then use that bundle as a type, meaning that methods can accept objects A compiler might display all the errors it encounters, until it gives up; at least in C++, it should not stop on the first error in the file, since that may more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed

Build Template Error Message

Sections 3, 4 and 5 just point to boilerplate code - it's just noise. C++ and class templates1Templating a member name Hot Network Questions How to book a flight if my passport doesn't state my gender? includes omitted using namespace std; typedef map TDblMap; typedef vector TDblMatrix; void f(const TDblMatrix &M) { M[0] = M[1]; } would yield the following error message: ** binary '=' :

For instance, the code fragment: using namespace std; void f(const map &Salary) { Salary["John Doe"] = 100000; } would yield the following error message: ** binary '[' : no operator So now we know we tried to copy a unique_ptr which is not allowed. GTIN validation Force Microsoft Word to NEVER auto-capitalize the name of my company Rosa Parks is a [symbol?] for the civil rights movement? The Grand C++ Error Explosion Competition They both seem to be pretty terrible.

asked 4 years ago viewed 2161 times active 4 years ago Get the weekly newsletter! Build Template Error Message Lexmark Uninstall It looks like clang is suppressing the second and further errors on a line. Basically I had to do a binary search by commenting code in and out :o). A second reason for bad diagnostics is the compiler developers themselves.

typedef map TdblMap; typedef vector TDblMatrix; typedef map my_TdblMap; typedef vector my_TDblMatrix; template inline void g(T& t) { t[0] = t[1]; } void f1(const TDblMatrix &M) { Longest C++ Program One problem tools like stlfilt face is that C++ compilers and libraries are under active development. With interactive error reporting, you would click on an "expand name" button to see it. 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

Build Template Error Message Lexmark Uninstall

The Problem Templates are one of the most powerful features of C++, and provide the language with a serious advantage over many of its brethren. How do I deal with players always (greedily) pushing for higher rewards? Build Template Error Message Express non-type template arguments in their symbolic form. Best Error Messages Is the empty set homeomorphic to itself?

American English: are [ə] and [ʌ] different phonemes? news gcc is implemented in C) or because they are so used to certain template techniques that they avoid certain errors (e.g. All of them have some diagnostic messages that are very useful, and all of them have some that are completely useless. Review code for foo and check for anything causing a copy. C++ Template Error Messages

Hot Network Questions Equation goes outside the boundary with eqnarray environment! And if this happens deep within a library somewhere, the error message might be thousands of lines long. Why Gimbal Only Inner Cluster? have a peek at these guys What are templates, and why should I care?

This strategy also allows an ML compiler's code generator to make tradeoffs between the size of the code it generates and that code's efficiency -- C++ compilers get no such choice. Stlfilt Win! –Joey Adams Apr 5 '11 at 17:12 7 @JoeyAdams: Please report this as a bug than –the_drow Apr 15 '11 at 12:09 8 @the_drow It's a feature. –Mateen more hot questions question feed lang-cpp about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation

share|improve this answer edited Nov 2 '11 at 15:33 answered Nov 2 '11 at 0:33 Lightness Races in Orbit 216k34332581 1 Whilst this may theoretically answer the question, it would

You get syntax forms, natural error messages, and everything else an in-language system would provide. 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 If later the compiler is required to give a diagnostic that references the type, it will emit the bare type instead of the typedef. C++ Error Message In the example above, wouldn't it be nice to get a message like "main.cpp", line 8: the argument to std::sort must be a mutable iterator Such a mechanism would work by

share|improve this answer answered Apr 21 '11 at 4:26 Jerry Coffin 33.6k456130 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Template function names are specified by providing the function template signature and the template argument list rather than giving the function signature of the specialization. Exporting an animation as a gif file Subtraction with a negative result An empire to last a hundred centuries GTIN validation Why don't most major game engines use gifs for animated check my blog as before ...

Join them; it only takes a minute: Sign up How to deal with way too long STL template error report? All my comments for item 1 apply here. 3. In the meantime, users should contact their compiler vendors when they get messages that are difficult to use. Haskell does it by turning (Show x) => into an implicit parameter to the function f added by the compiler, something like this: type Show a = a -> String showList

colorgcc seems to be abandoned since 1999. Templates are a natural match for lists (and container classes in general) because they not only let programmers write one List implementation rather than many different List kinds for all the Recent Articles Headline Dr. That is, if a class takes a function as a template parameter, the class type is expressed in error messages using the function name, not its address. (The address isn't known

If we had that problem in a Lisp system, it would be no problem: just load a bignum package and rewrite your macro to use it, and everything works out (and

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