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string_proxy.h
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205 lines (166 loc) · 4.98 KB
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#ifndef Rcpp__vector__string_proxy_h
#define Rcpp__vector__string_proxy_h
namespace Rcpp{
namespace internal{
template<int RTYPE> class string_proxy {
public:
typedef typename ::Rcpp::Vector<RTYPE> VECTOR ;
string_proxy() : parent(0), index(-1){};
/**
* Creates a proxy
*
* @param v reference to the associated character vector
* @param index index
*/
string_proxy( VECTOR& v, int index_ ) :
parent(&v), index(index_){
RCPP_DEBUG( "string_proxy( VECTOR& = <%p>, index_ = %d) ", v.get__(), index_ ) ;
}
string_proxy( const string_proxy& other ) :
parent(other.parent), index(other.index){} ;
/**
* lhs use. Assign the value of the referred element to
* the current content of the element referred by the
* rhs proxy
*
* @param rhs another proxy, possibly from another vector
*/
string_proxy& operator=(const string_proxy& other){
set( other.get() ) ;
return *this ;
}
string_proxy& operator=( const const_string_proxy<RTYPE>& other) ;
string_proxy& operator=( const String& s) ;
/**
* lhs use. Assigns the value of the referred element
* of the character vector
*
* @param rhs new content for the element referred by this proxy
*/
template <typename T>
string_proxy& operator=(const std::basic_string<T>& rhs){
set( rhs ) ;
return *this ;
}
string_proxy& operator=(const char* rhs){
set( Rf_mkChar( rhs ) ) ;
return *this ;
}
string_proxy& operator=(const wchar_t* rhs){
set( internal::make_charsexp( rhs ) ) ;
return *this ;
}
string_proxy& operator=(SEXP rhs){
set( rhs ) ;
return *this ;
}
void import( const string_proxy& other){
parent = other.parent ;
index = other.index ;
}
/**
* lhs use. Adds the content of the rhs proxy to the
* element this proxy refers to.
*/
template <typename T>
string_proxy& operator+=(const T& rhs) ;
/**
* rhs use. Retrieves the current value of the
* element this proxy refers to.
*/
operator SEXP() const {
return get() ;
}
/**
* rhs use. Retrieves the current value of the
* element this proxy refers to and convert it to a
* C string
*/
operator /* const */ char*() const {
return const_cast<char*>( CHAR(get()) );
}
/**
* Prints the element this proxy refers to to an
* output stream
*/
template <int RT>
friend std::ostream& operator<<(std::ostream& os, const string_proxy<RT>& proxy);
template <int RT>
friend std::string operator+( const std::string& x, const string_proxy<RT>& proxy);
void swap( string_proxy& other ){
SEXP tmp = STRING_ELT(*parent, index) ;
SET_STRING_ELT( *parent, index, STRING_ELT( *(other.parent), other.index) ) ;
SET_STRING_ELT( *(other.parent), other.index, tmp ) ;
}
VECTOR* parent;
int index ;
inline void move( int n ){ index += n ;}
inline SEXP get() const {
return STRING_ELT( *parent, index ) ;
}
template <typename T>
inline void set( const T& x ){
set( internal::make_charsexp(x) ) ;
}
inline void set(SEXP x){
SET_STRING_ELT( *parent, index, x ) ;
}
inline int size() const { return strlen( begin() ) ; }
bool operator==( const char* other){
return strcmp( begin(), other ) == 0 ;
}
bool operator!=( const char* other){
return strcmp( begin(), other ) != 0 ;
}
bool operator==( const string_proxy& other){
return strcmp( begin(), other.begin() ) == 0 ;
}
bool operator!=( const string_proxy& other){
return strcmp( begin(), other.begin() ) != 0 ;
}
private:
typedef const char* iterator ;
typedef const char& reference ;
inline iterator begin() const { return CHAR( STRING_ELT( *parent, index ) ) ; }
inline iterator end() const { return begin() + size() ; }
static std::string buffer ;
} ;
template <int RT>
bool operator<( const string_proxy<RT>& lhs, const string_proxy<RT>& rhs) {
return strcmp(
const_cast<char *>(lhs.begin() ),
const_cast<char *>(rhs.begin())
) < 0 ;
}
template <int RT>
bool operator>( const string_proxy<RT>& lhs, const string_proxy<RT>& rhs) {
return strcmp(
const_cast<char *>(lhs.begin() ),
const_cast<char *>(rhs.begin())
) > 0 ;
}
template <int RT>
bool operator>=( const string_proxy<RT>& lhs, const string_proxy<RT>& rhs) {
return strcmp(
const_cast<char *>(lhs.begin() ),
const_cast<char *>(rhs.begin())
) >= 0 ;
}
template <int RT>
bool operator<=( const string_proxy<RT>& lhs, const string_proxy<RT>& rhs) {
return strcmp(
const_cast<char *>(lhs.begin() ),
const_cast<char *>(rhs.begin())
) <= 0 ;
}
template<int RTYPE> std::string string_proxy<RTYPE>::buffer ;
inline std::ostream& operator<<(std::ostream& os, const string_proxy<STRSXP>& proxy) {
os << static_cast<const char*>(proxy) ;
return os;
}
inline std::string operator+( const std::string& x, const string_proxy<STRSXP>& y ){
return x + static_cast<const char*>(y) ;
}
}
}
#endif