bison

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Akim Demaille b870d5fee4 c++: don't copy the lookahead

The current implementation of parser::context keeps a copy of the
lookahead.  This is troublesome since we support move-only types.
Besides, while GCC is happy with the current implementation, Clang
complains that the ctor it needs to build the copy of the lookahead is
not yet available.

    461. calc.at:1120: testing Calculator C++ %defines %locations parse.error=verbose %name-prefix "calc" %verbose  ...
    calc.at:1120: COLUMNS=1000; export COLUMNS;  bison --color=no -fno-caret -Wno-deprecated -o calc.cc calc.y
    calc.at:1120: $CXX $CXXFLAGS $CPPFLAGS  $LDFLAGS -o calc calc.cc calc-lex.cc calc-main.cc $LIBS
    stderr:
    In file included from calc-lex.cc:7:
    calc.hh:351:12: error: instantiation of function 'calc::parser::basic_symbol<calc::parser::by_type>::basic_symbol' required here, but no definition is available [-Werror,-Wundefined-func-template]
        struct symbol_type : basic_symbol<by_type>
               ^
    calc.hh:273:7: note: forward declaration of template entity is here
          basic_symbol (const basic_symbol& that);
          ^
    calc.hh:351:12: note: add an explicit instantiation declaration to suppress this warning if 'calc::parser::basic_symbol<calc::parser::by_type>::basic_symbol' is explicitly instantiated in another translation unit
        struct symbol_type : basic_symbol<by_type>
               ^
    1 error generated.
    In file included from calc-main.cc:7:
    calc.hh:351:12: error: instantiation of function 'calc::parser::basic_symbol<calc::parser::by_type>::basic_symbol' required here, but no definition is available [-Werror,-Wundefined-func-template]
        struct symbol_type : basic_symbol<by_type>
               ^
    calc.hh:273:7: note: forward declaration of template entity is here
          basic_symbol (const basic_symbol& that);
          ^
    calc.hh:351:12: note: add an explicit instantiation declaration to suppress this warning if 'calc::parser::basic_symbol<calc::parser::by_type>::basic_symbol' is explicitly instantiated in another translation unit
        struct symbol_type : basic_symbol<by_type>
               ^
    1 error generated.
    stdout:
    calc.at:1120: exit code was 1, expected 0
    461. calc.at:1120: 461. Calculator C++ %defines %locations parse.error=verbose %name-prefix "calc" %verbose  (calc.at:1120): FAILED (calc.at:1120)

* data/skeletons/lalr1.cc (context::yyla_): Make it a const-ref.
Move the implementation out of the declaration.

2020-02-27 21:49:56 +01:00