Re: Linking error when changing > to >>

On 14-11-16 19:16, Larry Evans wrote:
> which #include's the .cpp files instead of just "example.hpp"?

yes. It's quite impossible to get a linker error that way. See
https://github.com/sehe/linker_error_example (commit ZIP
<https://codeload.github.com/sehe/linker_error_example/zip/eb4356d8cdf1be32a606fb65e8deb1e286fb03ca>),
alternatively with the (originally) breaking change applied
<https://github.com/sehe/linker_error_example/archive/948f476e6be54fadf9ad60c57a4bd6c0193970be.zip>).

> Could you please give me a hit about what I'm doing wrong?
Not looking at the error message, but going from the code changes:

 1. you forgot to remove the cpps that you now include from the build/link
 2. you include types.hpp AFTER use in example.cpp. That might work
    because of POI but it's not a logical thing to do as example_def
    USES types.h
 3. you didn't spot the name clash in example.cpp, possibly for that
    same reason

> Could you provide an example? Is:
>
>  
> https://github.com/cppljevans/boost_1_61_problem/blob/master/expression.cpp#L9
>
> such an example?
No that's not it, because the instantiation is very different from that.
Try
<https://github.com/sehe/linker_error_example/commit/021b36105e010b9134b76cdf8b47952589d5fff8#diff-947c7a9582917a8ff2de55181f3049caR38>:

namespace {
    template <typename Seq, size_t N>
        using field_at =
boost::fusion::basic_iterator<boost::fusion::struct_iterator_tag,
boost::fusion::random_access_traversal_tag, Seq, N>;
    template <typename Seq, size_t N, size_t M>
        using fields   = boost::fusion::iterator_range<field_at<Seq, N>,
field_at<Seq, M> >;

    using Attributes = fields<client::ast::VariableDec, 1, 2>;
    using Context  = x3::context<x3::skipper_tag,
x3::char_class<boost::spirit::char_encoding::ascii, x3::space_tag>
const, x3::unused_type>;
}

template bool parse_rule<std::string::const_iterator, Context,
fields<client::ast::VariableDec, 1, 2> >(
    decltype(type),
    std::string::const_iterator &,
    std::string::const_iterator const &,
    Context const &,
    Attributes &);

See on my
https://github.com/sehe/linker_error_example/tree/explicit_instantiation
branch (ZIP
<https://github.com/sehe/linker_error_example/archive/explicit_instantiation.zip>)

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