zypp::C_Str Class Reference

Convenience char* constructible from std::string and char*, it maps (char*)0 to an empty string. More...

#include <zypp-core/base/String.h>

Public Types
using	size_type = std::string::size_type

Public Member Functions
	C_Str ()
	C_Str (char *c_str_r)
	C_Str (const char *c_str_r)
	C_Str (const std::string &str_r)
	C_Str (const boost::string_ref &str_r)
bool	isNull () const
bool	empty () const
size_type	size () const
	operator const char * () const
const char *	c_str () const

Private Attributes
const char *const	_val
size_type	_sze

Related Symbols
(Note that these are not member symbols.)
std::ostream &	operator<< (std::ostream &str, const C_Str &obj)
	Stream output.

Detailed Description

Convenience char* constructible from std::string and char*, it maps (char*)0 to an empty string.

bool hasPrefix( const std::string & str_r, const std::string & prefix_r )
{ return( ::strncmp( str_r.c_str(), prefix_r.c_str(), prefix_r.size() ) == 0 ); }

Called with a plain char* as argument, the std::string is created form for nothing. The implementation actually does not use the std::string.

Best would be to implement hasPrefix for each combination of char* and std::string arguments:

bool hasPrefix( const std::string & str_r, const std::string & prefix_r )
{ return( ::strncmp( str_r.c_str(), prefix_r.c_str(), prefix_r.size() ) == 0 ); }
 
bool hasPrefix( const std::string & str_r, const char * prefix_r )
{ return( !prefix_r || ::strncmp( str_r.c_str(), prefix_r, ::strlen(prefix_r) ) == 0 ); }
 
bool hasPrefix( const char * str_r, const std::string & prefix_r )
{ return( str_r ? ::strncmp( str_r, prefix_r.c_str(), prefix_r.size() ) == 0 : prefix_r.empty() ); }
 
bool hasPrefix( const char * str_r, const char * prefix_r )
{ return( str && prefix_r ? ::strncmp( str_r, prefix_r, ::strlen(prefix_r) ) == 0
                          : !((str_r && *str_r) || (prefix_r && *prefix_r)); }

This is where C_Str can help. Constructible from std::string and char*, it reduces the std::string to its char*. At the same, time it converts (char*)0 into an "" string.

bool hasPrefix( const C_Str & str_r, const C_Str & prefix_r )
{ return( ::strncmp( str_r, prefix_r, prefix_r.size() ) == 0 ); }

Todo

Check whether to replace by boost::string_ref

Definition at line 91 of file String.h.

Member Typedef Documentation

size_type

using zypp::C_Str::size_type = std::string::size_type

Definition at line 94 of file String.h.

Constructor & Destructor Documentation

C_Str() [1/5]

zypp::C_Str::C_Str ( )

inline

Definition at line 97 of file String.h.

C_Str() [2/5]

zypp::C_Str::C_Str ( char * c_str_r )

inline

Definition at line 98 of file String.h.

C_Str() [3/5]

zypp::C_Str::C_Str ( const char * c_str_r )

inline

Definition at line 99 of file String.h.

C_Str() [4/5]

zypp::C_Str::C_Str ( const std::string & str_r )

inline

Definition at line 100 of file String.h.

C_Str() [5/5]

zypp::C_Str::C_Str ( const boost::string_ref & str_r )

inline

Definition at line 101 of file String.h.

Member Function Documentation

isNull()

bool zypp::C_Str::isNull ( ) const

inline

Definition at line 107 of file String.h.

empty()

bool zypp::C_Str::empty ( ) const

inline

Definition at line 108 of file String.h.

size()

size_type zypp::C_Str::size ( ) const

inline

Definition at line 109 of file String.h.

operator const char *()

zypp::C_Str::operator const char * ( ) const

inline

Definition at line 116 of file String.h.

c_str()

const char * zypp::C_Str::c_str ( ) const

inline

Definition at line 117 of file String.h.

Friends And Related Symbol Documentation

operator<<()

std::ostream & operator<< ( std::ostream & str, const C_Str & obj )

related

Stream output.

Definition at line 125 of file String.h.

Member Data Documentation

_val

const char* const zypp::C_Str::_val

private

Definition at line 120 of file String.h.

_sze

size_type zypp::C_Str::_sze

mutableprivate

Definition at line 121 of file String.h.

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The documentation for this class was generated from the following file:

• zypp-core/base/String.h