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Binding.h
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101 lines (80 loc) · 2.51 KB
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#ifndef Rcpp_proxy_EnvironmentBinding_h
#define Rcpp_proxy_EnvironmentBinding_h
namespace Rcpp{
template <typename EnvironmentClass>
class BindingPolicy {
public:
class Binding : public GenericProxy<Binding> {
public:
Binding( EnvironmentClass& env_, std::string name_) :
env(env_), name(std::move(name_)){}
inline bool active() const {
return env.bindingIsActive(name) ;
}
inline bool locked() const {
return env.bindingIsLocked(name) ;
}
inline bool exists() const {
return env.exists(name) ;
}
void lock() {
env.lockBinding(name) ;
}
void unlock(){
env.unlockBinding(name) ;
}
Binding& operator=(const Binding& rhs){
if( *this != rhs )
set( rhs.get() ) ;
return *this ;
}
template <typename T>
Binding& operator=(const T& rhs) {
set( wrap(rhs) ) ;
return *this ;
}
template <typename T> operator T() const{
return as<T>( get() ) ;
}
private:
SEXP get() const {
return env.get( name ) ;
}
void set( SEXP x){
env.assign(name, x ) ;
}
EnvironmentClass& env ;
std::string name ;
} ;
class const_Binding : public GenericProxy<const_Binding> {
public:
const_Binding( const EnvironmentClass& env_, std::string name_) :
env(env_), name(std::move(name_)){}
inline bool active() const {
return env.bindingIsActive(name) ;
}
inline bool locked() const {
return env.bindingIsLocked(name) ;
}
inline bool exists() const {
return env.exists(name) ;
}
template <typename T> operator T() const {
return as<T>( get() ) ;
}
private:
SEXP get() const {
return env.get( name ) ;
}
const EnvironmentClass& env ;
std::string name ;
} ;
const_Binding operator[]( const std::string& name) const {
return const_Binding( static_cast<const EnvironmentClass&>(*this), name ) ;
}
Binding operator[](const std::string& name){
return Binding( static_cast<EnvironmentClass&>(*this), name ) ;
}
} ;
}
#endif