다음과 같은 영혼 문법을 사용합니다. push_back(at_c<0>(qi::_val), qi::_1)
표준을 사용하여 struct myresult
에 AST 노드의 벡터를 만들려고하는데 컴파일 오류가 발생합니다 (아래 참조).boost spirit grammar (phoenix push_back은 컴파일 오류가 발생 함)에서 결과 얻기
typedef vector<ZLS::ASTNode*> vector_astnode_t;
struct myresult {
vector_astnode_t turtle_commands;
};
BOOST_FUSION_ADAPT_STRUCT
(
myresult,
(vector_astnode_t, turtle_commands)
);
namespace spirit = boost::spirit;
namespace qi = boost::spirit::qi;
namespace ascii = boost::spirit::ascii;
namespace phoenix = boost::phoenix;
struct debugprint {
string _name;
debugprint(string n) : _name(n) {}
void operator()(int const& i, qi::unused_type, qi::unused_type) const {
cout << _name << std::endl;
}
void operator()(qi::unused_type, qi::unused_type, qi::unused_type) const {
cout << _name << std::endl;
}
// todo: more of these for each type
};
template <typename Iterator>
struct lsystem_parser : qi::grammar<Iterator, myresult() > {
lsystem_parser(ZLS::Context* ctx)
: lsystem_parser::base_type(start)
, _ctx(ctx)
{
using qi::char_;
using qi::float_;
using qi::eps;
using qi::lit;
using qi::_1;
using qi::_val;
using phoenix::ref;
using phoenix::push_back;
using phoenix::at_c;
float_parameters = '(' >> (float_ >> *(',' >> float_)) >> ')';
/// turtle grammar ///
draw_forward = (char_('F') [ _val = new ZLS::ASTDrawForward(_ctx,0)])
[debugprint("draw_forward")];
move_forward = (char_('f') [ _val = new ZLS::ASTMoveForward(_ctx,0)])
[debugprint("move_forward")];
turn_left = (char_('+') [ _val = new ZLS::ASTTurnLeft(_ctx,0)])
[debugprint("turn_left")];
turn_right = (char_('-') [ _val = new ZLS::ASTTurnRight(_ctx,0)])
[debugprint("turn_right")];
push_state = (char_('[') [ _val = new ZLS::ASTPushState(_ctx)])
[debugprint("push_state")];
pop_state = (char_(']') [ _val = new ZLS::ASTPopState(_ctx) ])
[debugprint("pop_state")];
turtle_commands = (draw_forward
| move_forward
| turn_left
| turn_right
| push_state
| pop_state);
// >>>> THIS IS WHAT IS CAUSING THE ERROR <<<<<
start = *turtle_commands[ push_back(at_c<0>(qi::_val), qi::_1) ];
}
qi::rule< Iterator, myresult() > start;
qi::rule< Iterator, vector<float> > float_parameters;
qi::rule< Iterator, ZLS::ASTNode* > draw_forward;
qi::rule< Iterator, ZLS::ASTNode* > move_forward;
qi::rule< Iterator, ZLS::ASTNode* > turn_left;
qi::rule< Iterator, ZLS::ASTNode* > turn_right;
qi::rule< Iterator, ZLS::ASTNode* > push_state;
qi::rule< Iterator, ZLS::ASTNode* > pop_state;
qi::rule< Iterator, ZLS::ASTNode* > turtle_commands;
ZLS::Context* _ctx;
};
다음은 엑스 코드에서 반환되는 실제 오류입니다 :
container.hpp:492: error: no matching function for call to 'std::vector<ZLS::ASTNode*, std::allocator<ZLS::ASTNode*> >::push_back(const boost::fusion::unused_type&)'
stl_vector.h:600: note: candidates are: void std::vector<_Tp, _Alloc>::push_back(const _Tp&) [with _Tp = ZLS::ASTNode*, _Alloc = std::allocator<ZLS::ASTNode*>]
container.hpp:492: error: return-statement with a value, in function returning 'void'
편집 : 다음은되어 컴파일하고 작품을 수정 정신 문법. 당신은 직접 세만 틱 액션의 내부 operator new
을 사용할 수 없습니다 turtle_commands = ... [_val = _1]
template <typename Iterator>
struct lsystem_parser : qi::grammar<Iterator, vector_astnode_t() > {
lsystem_parser(ZLS::Context* ctx)
: lsystem_parser::base_type(start)
, _ctx(ctx)
{
using qi::char_;
using qi::float_;
using qi::eps;
using qi::lit;
using qi::_1;
using qi::_val;
using phoenix::ref;
using phoenix::push_back;
using phoenix::at_c;
using phoenix::new_;
float_parameters = '(' >> (float_ >> *(',' >> float_)) >> ')';
/// turtle grammar ///
draw_forward = (char_('F') [ _val = new_<ZLS::ASTDrawForward>(_ctx, (ZLS::ASTNode*)0)])
[debugprint("draw_forward")];
move_forward = (char_('f') [ _val = new_<ZLS::ASTMoveForward>(_ctx, (ZLS::ASTNode*)0)])
[debugprint("move_forward")];
turn_left = (char_('+') [ _val = new_<ZLS::ASTTurnLeft>(_ctx, (ZLS::ASTNode*)0)])
[debugprint("turn_left")];
turn_right = (char_('-') [ _val = new_<ZLS::ASTTurnRight>(_ctx, (ZLS::ASTNode*)0)])
[debugprint("turn_right")];
push_state = (char_('[') [ _val = new_<ZLS::ASTPushState>(_ctx)])
[debugprint("push_state")];
pop_state = (char_(']') [ _val = new_<ZLS::ASTPopState>(_ctx) ])
[debugprint("pop_state")];
turtle_commands = (draw_forward
| move_forward
| turn_left
| turn_right
| push_state
| pop_state)[_val = _1];
start = *turtle_commands >> qi::eps;
}
qi::rule< Iterator, vector_astnode_t() > start;
qi::rule< Iterator, vector<float> > float_parameters;
qi::rule< Iterator, ZLS::ASTNode*() > draw_forward;
qi::rule< Iterator, ZLS::ASTNode*() > move_forward;
qi::rule< Iterator, ZLS::ASTNode*() > turn_left;
qi::rule< Iterator, ZLS::ASTNode*() > turn_right;
qi::rule< Iterator, ZLS::ASTNode*() > push_state;
qi::rule< Iterator, ZLS::ASTNode*() > pop_state;
qi::rule< Iterator, ZLS::ASTNode*() > turtle_commands;
ZLS::Context* _ctx;
};