Bison C++ invalid use of unique_ptr

Question

I am writing a bison file for parsing. In a declared grammar rule, I'm trying to create a unique_ptr pointing to a syntax tree node (DeclAST) that contains multiple symbol table entries. However, an error message was encountered:

parser.y:73:19: error: invalid use of ‘class std::unique_ptr<DeclAST>’
   73 |$$ = std::make_unique<DeclAST>(syms,2,$3);

The code at line 73 of parser.y and the context-sensitive code are as follows:

ConstDecl:{declare =1;} CONST Btype COnstDefs{declare=0;} SEMI
{
$$ = std::make_unique<DeclAST>(syms,2,$3); 
...
}

I have made it clear that the node type of ConstDecl is DeclAST:

%type< unique_ptr<DeclAST> > ConstDecl
%type< int > Btype

For Btype, the corresponding code in parser.y is:

Btype: ICONST {$$ = INT_TYPE;}
       | FCONST {$$ = FLOAT_TYPE;}

Also:

#define INT_TYPE 258
#define FLOAT_TYPE 259
#define SIZE 100

I checked my definition of DeclAST:

class DeclAST
{
   Symtab** names;
   int names_count;
   int data_type;

   public:
      DeclAST(Symtab** s, int nsc, int dty)
        :names(s), names_count(nsc), data_type(dty);
};

For Symtab:

Symtab** syms = (Symtab**) malloc(SIZE*sizeof(Symtab*));

I also included the header file . All things seem correct.
Any detailed help will be appreciated.

Bison C++ invalid use of unique_ptr

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