std::shared_ptr mit yacc

[geri1]

Hi,

ich habe ein paar schwierigkeiten shared_ptrs in mein yacc file einzubauen (ohne boost)...wie bekomme ich das am besten hin?

mein background research hat folgendes ergeben:

%union in yacc/bison only allows POD types...hmm

%{
#include <cstdio>
#include <cstdlib>
#include <cassert>
#include <memory>
#include "Token.h"
#include "Tree.h"

extern void yyerror(char* message);
extern int yylex(void);
extern int yyparse(void);

%}

%union {
	int ival;	/* NUMBER */
	int opval;	/* ADDOP MULOP */
	Tree *tval;
}

%left <opval> 	ADDOP
%left <opval> 	MULOP
%token <ival>	NUMBER

%type <tval> expr

%%

expr_list
	: expr_list expr '\n' 
		{ $2->print(0); 
		  fprintf(stderr, "Value = %d\n", eval($2)); }
	| expr '\n' 
		{ $1->print(0); 
		  fprintf(stderr, "Value = %d\n", eval($1)); }

expr 
	: expr ADDOP expr 
		{ $$ = new Tree(Token(ADDOP,$2),$1,$3); }
	| expr MULOP expr 
		{ $$ = new Tree(Token(MULOP,$2),$1,$3); }
	| '(' expr ')'
		{ $$ = $2; }
	| NUMBER
		{ $$ = new Tree(Token(NUMBER,$1),nullptr,nullptr); }
	;

%%

ich moechte:

new Tree(Token(NUMBER,$1),nullptr,nullptr)

durch:

std::make_shared<Tree>(new Tree(Token(ADDOP,$2),$1,$3))

[Furble Wurble]

Was für ein yacc benutzt Du denn?

[geri1]

ich bin hier auf osx und windows.

auf osx verwende ich: yacc + lex: http://www.unix.com/man-page/osx/1/yacc/
auf windows verwende ich: bison + flex

[Furble Wurble]

Also bison in beiden Fällen, wenn ich Deinen Link richtig interpretiere.

Dann steht doch einiges in der Doku dazu: http://www.gnu.org/software/bison/manual/html_node/C_002b_002b-Variants.html#C_002b_002b-Variants

[geri1]

ich weiss trotzdem nicht wie ich shared_ptr einbauen kann ohne boost::variant!?

[geri1]

hab das hier auf osx:

$ yacc --version
bison (GNU Bison) 2.3
Written by Robert Corbett and Richard Stallman.

Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ flex --version
flex 2.5.35 Apple(flex-31)

[geri1]

mit folgenden change bekomme ich diesen fehler... vorschlaege/loesungen?

y.tab.cpp:1123:11: error: call to implicitly-deleted default constructor of 'YYSTYPE'
  YYSTYPE yyval;

%{ 
#include <cstdio> 
#include <cstdlib> 
#include <cassert> 
#include <memory> 
#include "Token.h" 
#include "Tree.h" 

extern void yyerror(char* message); 
extern int yylex(void); 
extern int yyparse(void); 

%} 

%union { 
    int ival;   /* NUMBER */ 
    int opval;  /* ADDOP MULOP */ 
    std::shared_ptr<Tree> tval; 
} 

%left <opval>   ADDOP 
%left <opval>   MULOP 
%token <ival>   NUMBER 

%type <tval> expr 

%% 

expr_list 
    : expr_list expr '\n' 
        { $2.get()->print(0); 
          fprintf(stderr, "Value = %d\n", eval($2.get())); } 
    | expr '\n' 
        { $1.get()->print(0); 
          fprintf(stderr, "Value = %d\n", eval($1.get())); } 

expr 
    : expr ADDOP expr 
        { $$ = std::make_shared<decltype($$)>(new Tree(Token(ADDOP,$2),$1,$3)); } 
    | expr MULOP expr 
        { $$ = std::make_shared<decltype($$)>(new Tree(Token(MULOP,$2),$1,$3)); } 
    | '(' expr ')' 
        { $$ = $2; } 
    | NUMBER 
        { $$ = std::make_shared<decltype($$)>(new Tree(Token(NUMBER,$1),nullptr,nullptr)); } 
    ; 

%%

[__cu]

geri1 schrieb:

$$ = std::make_shared<decltype($$)>(new Tree(Token(ADDOP,$2),$1,$3));

make_shared will keinen Pointer haben, sondern die Argumente, um den selber anzulegen.
siehe [url] http://www.cplusplus.com/reference/memory/make_shared [/url]

also eher so:

$$ = std::make_shared<Tree>(Token(ADDOP, $2), $1, $3));

[geri1]

ok, habe deine changes eingebaut. jedoch bekomme ich noch folgende errors:

$ mingw32-make clean; mingw32-make
rm -f y.tab.* lex.yy.* y.output y.tab.o lex.yy.o Token.o Tree.o Eval.o main.o ma
in.exe
bison  -dv -o y.tab.cpp calc.y
g++ -g -Wall -std=gnu++11   -c -o y.tab.o y.tab.cpp
y.tab.cpp:1058:9: error: use of deleted function 'YYSTYPE::YYSTYPE()'
 YYSTYPE yylval;
         ^
y.tab.cpp:123:15: note: 'YYSTYPE::YYSTYPE()' is implicitly deleted because the d
efault definition would be ill-formed:
 typedef union YYSTYPE
               ^
calc.y:18:24: error: union member 'YYSTYPE::tval' with non-trivial 'constexpr st
d::shared_ptr<_Tp>::shared_ptr() [with _Tp = Tree]'
  std::shared_ptr<Tree> tval;
                        ^
y.tab.cpp: In function 'int yyparse()':
y.tab.cpp:1110:30: error: use of deleted function 'YYSTYPE::YYSTYPE()'
     YYSTYPE yyvsa[YYINITDEPTH];
                              ^
y.tab.cpp:1110:30: error: use of deleted function 'YYSTYPE::~YYSTYPE()'
y.tab.cpp:123:15: note: 'YYSTYPE::~YYSTYPE()' is implicitly deleted because the
default definition would be ill-formed:
 typedef union YYSTYPE
               ^
calc.y:18:24: error: union member 'YYSTYPE::tval' with non-trivial 'std::shared_
ptr<Tree>::~shared_ptr()'
  std::shared_ptr<Tree> tval;
                        ^
y.tab.cpp:1110:30: error: use of deleted function 'YYSTYPE::~YYSTYPE()'
     YYSTYPE yyvsa[YYINITDEPTH];
                              ^
y.tab.cpp:1122:11: error: use of deleted function 'YYSTYPE::YYSTYPE()'
   YYSTYPE yyval;
           ^
y.tab.cpp:1122:11: error: use of deleted function 'YYSTYPE::~YYSTYPE()'
y.tab.cpp:1296:12: error: use of deleted function 'YYSTYPE& YYSTYPE::operator=(c
onst YYSTYPE&)'
   *++yyvsp = yylval;
            ^
y.tab.cpp:123:15: note: 'YYSTYPE& YYSTYPE::operator=(const YYSTYPE&)' is implici
tly deleted because the default definition would be ill-formed:
 typedef union YYSTYPE
               ^
calc.y:18:24: error: union member 'YYSTYPE::tval' with non-trivial 'std::shared_
ptr<_Tp>& std::shared_ptr<_Tp>::operator=(const std::shared_ptr<_Tp>&) [with _Tp
 = Tree]'
  std::shared_ptr<Tree> tval;
                        ^
y.tab.cpp:1326:9: error: use of deleted function 'YYSTYPE& YYSTYPE::operator=(co
nst YYSTYPE&)'
   yyval = yyvsp[1-yylen];
         ^
y.tab.cpp:1388:12: error: use of deleted function 'YYSTYPE& YYSTYPE::operator=(c
onst YYSTYPE&)'
   *++yyvsp = yyval;
            ^
y.tab.cpp:1414:35: warning: deprecated conversion from string constant to 'char*
' [-Wwrite-strings]
       yyerror (YY_("syntax error"));
                                   ^
y.tab.cpp:1528:12: error: use of deleted function 'YYSTYPE& YYSTYPE::operator=(c
onst YYSTYPE&)'
   *++yyvsp = yylval;
            ^
y.tab.cpp:1557:35: warning: deprecated conversion from string constant to 'char*
' [-Wwrite-strings]
   yyerror (YY_("memory exhausted"));
                                   ^
y.tab.cpp: In function 'void __static_initialization_and_destruction_0(int, int)
':
y.tab.cpp:1058:9: error: use of deleted function 'YYSTYPE::~YYSTYPE()'
 YYSTYPE yylval;
         ^
y.tab.cpp: In function 'void __tcf_0()':
y.tab.cpp:1058:9: error: use of deleted function 'YYSTYPE::~YYSTYPE()'
<builtin>: recipe for target 'y.tab.o' failed
mingw32-make: *** [y.tab.o] Error 1

[geri1]

folgender thread erklaert das porblem:

http://stackoverflow.com/questions/26964941/lex-yacc-no-member-name-and-declaration-error

wie kann ich das problem fixen?

[geri1]

help!?