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NodeProxy.h
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132 lines (95 loc) · 3.06 KB
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#ifndef Rcpp_proxy_NodeProxy_h
#define Rcpp_proxy_NodeProxy_h
namespace Rcpp{
template <typename NodeClass>
class NodeProxyPolicy {
public:
class ValueProxy {
public:
ValueProxy( SEXP node_ ) : node(node_){}
ValueProxy& operator=( const ValueProxy& rhs){
if(this != &rhs) set( rhs.get() ) ;
return *this ;
}
template <typename T>
ValueProxy& operator=( const T& rhs) {
return set( wrap(rhs) ) ;
}
template <typename T>
operator T() const {
return as<T>(get());
}
private:
SEXP node ;
inline SEXP get() const {
return CAR(node) ;
}
inline ValueProxy& set( SEXP x){
SETCAR(node, x) ;
return *this ;
}
} ;
class const_ValueProxy{
public:
const_ValueProxy(SEXP node_) : node(node_){}
template <typename T>
operator T() const {
return as<T>(get());
}
private:
SEXP node ;
inline SEXP get() const {
return CAR(node) ;
}
} ;
inline ValueProxy value() {
return ValueProxy( static_cast<NodeClass&>(*this).get() ) ;
}
inline const_ValueProxy value() const {
return const_ValueProxy( static_cast<const NodeClass&>(*this).get() ) ;
}
class TagProxy {
public:
TagProxy( SEXP node_ ) : node(node_){}
TagProxy& operator=( const TagProxy& rhs){
if(this != &rhs) set( rhs.get() ) ;
return *this ;
}
template <typename T>
TagProxy& operator=( const T& rhs){
return set( Symbol(rhs) ) ;
}
inline operator SEXP() const {
return get() ;
}
private:
SEXP node ;
inline SEXP get() const {
return TAG(node) ;
}
inline TagProxy& set(SEXP x){
SET_TAG(node, x) ;
return *this ;
}
} ;
class const_TagProxy {
public:
const_TagProxy( SEXP node_ ) : node(node_){}
inline operator SEXP() const {
return get() ;
}
private:
SEXP node ;
inline SEXP get() const {
return TAG(node) ;
}
} ;
inline TagProxy tag() {
return TagProxy( static_cast<NodeClass&>(*this).get() ) ;
}
inline const_TagProxy tag() const {
return const_TagProxy( static_cast<const NodeClass&>(*this).get() ) ;
}
} ;
}
#endif