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third_party_rust_cxx/book
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David Tolnay 96606d570e
Fix missing <string> include in std::string example 
The previous code works in _some_ STL implementations, namely if
_either_ of the following is true:

    1. At least one of the other four STL headers included by json.h
       transitively includes <string>, as opposed to just <stringfwd.h>; or

    2. The way std::variant is implemented does not require knowing the
       inner types' type traits when just naming the std::variant
       without yet instantiating any of its member function templates.

On other STL implementations in which neither of the above is true, this
example failed to build with an error such as:

    In file included from target/debug/build/example-d2d484e0c793273c/out/cxxbridge/sources/example/src/main.rs.cc:1:
    In file included from target/debug/build/example-d2d484e0c793273c/out/cxxbridge/crate/example/include/json.h:2:
    In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/map:60:
    In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/stl_tree.h:63:
    In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/stl_algobase.h:64:
    In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/stl_pair.h:59:
    In file included from /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/move.h:57:
    /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/type_traits:1339:23: error: implicit instantiation of undefined template 'std::basic_string<char>'
                        __bool_constant<__has_trivial_destructor(_Tp)>>
                                        ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/type_traits:3214:5: note: in instantiation of template class 'std::is_trivially_destructible<std::basic_string<char>>' requested here
        is_trivially_destructible<_Tp>::value;
        ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/variant:299:5: note: in instantiation of variable template specialization 'std::is_trivially_destructible_v<std::basic_string<char>>' requested here
              (is_trivially_destructible_v<_Types> && ...);
               ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/variant:308:4: note: in instantiation of static data member 'std::__detail::__variant::_Traits<std::monostate, double, std::basic_string<char>, std::vector<json>, std::map<std::basic_string<char>, json>>::_S_trivial_dtor' requested here
              _S_trivial_dtor && _S_trivial_move_ctor
              ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/variant:689:45: note: in instantiation of static data member 'std::__detail::__variant::_Traits<std::monostate, double, std::basic_string<char>, std::vector<json>, std::map<std::basic_string<char>, json>>::_S_trivial_move_assign' requested here
          _Move_assign_base<_Traits<_Types...>::_S_trivial_move_assign, _Types...>;
                                                ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/variant:692:28: note: in instantiation of template type alias '_Move_assign_alias' requested here
        struct _Variant_base : _Move_assign_alias<_Types...>
                               ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/variant:1318:15: note: in instantiation of template class 'std::__detail::__variant::_Variant_base<std::monostate, double, std::basic_string<char>, std::vector<json>, std::map<std::basic_string<char>, json>>' requested here
        : private __detail::__variant::_Variant_base<_Types...>,
                  ^
    target/debug/build/example-d2d484e0c793273c/out/cxxbridge/crate/example/include/json.h:33:63: note: in instantiation of template class 'std::variant<std::monostate, double, std::basic_string<char>, std::vector<json>, std::map<std::basic_string<char>, json>>' requested here
      std::variant<std::monostate, number, string, array, object> value;
                                                                  ^
    /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/stringfwd.h:74:11: note: template is declared here
        class basic_string;
              ^
2022-09-02 21:04:02 -07:00
..
css Book style tweaks 2020-11-17 08:22:44 -08:00
diagram Reset white background on graphic 2022-04-10 17:55:54 -07:00
src Fix missing <string> include in std::string example 2022-09-02 21:04:02 -07:00
theme Tweak head.hbs spacing to render neater with newest version of mdbook 2021-11-27 10:25:29 -08:00
.gitignore Add github link to website sidebar 2020-11-13 16:32:31 -08:00
book.toml Book content 2020-11-17 08:22:44 -08:00
build.js Add book opengraph metadata 2020-11-17 08:22:44 -08:00
build.sh Add github link to website sidebar 2020-11-13 16:32:31 -08:00
package-lock.json Downgrade to cheerio 0.22 2020-11-13 19:35:16 -08:00
package.json Downgrade to cheerio 0.22 2020-11-13 19:35:16 -08:00
README.md Add readme for book directory 2020-09-02 11:58:17 -07:00

README.md

Published automatically to https://cxx.rs from master branch.

To build and view locally:

  • Install mdBook: cargo install mdbook.
  • Run mdbook build in this directory.
  • Open the generated build/index.html.