180 lines
6.8 KiB
C++
180 lines
6.8 KiB
C++
// (C) Copyright Gennadiy Rozental 2001-2014.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/test for the library home page.
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//
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// File : $RCSfile$
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//
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// Version : $Revision$
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//
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// Description : simple string class definition
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// ***************************************************************************
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#ifndef CONST_STRING_HPP
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#define CONST_STRING_HPP
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// STL
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#include <iterator>
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#include <string>
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#include <cstring>
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using std::string;
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namespace common_layer {
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// ************************************************************************** //
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// ************** const_string ************** //
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// ************************************************************************** //
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class const_string {
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public:
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// Subtypes
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typedef char const* iterator;
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typedef char const* const_iterator;
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typedef std::reverse_iterator<iterator> reverse_iterator;
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typedef reverse_iterator const_reverse_iterator;
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// Constructor
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const_string()
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: m_begin( "" ), m_end( m_begin ) {}
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// Copy constructor is generated by compiler
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const_string( const std::string& s )
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: m_begin( s.c_str() ),
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m_end( m_begin + s.length() ) {}
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const_string( char const* s )
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: m_begin( s ? s : "" )
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, m_end( s ? m_begin + std::strlen( s ) : m_begin )
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{}
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const_string( char const* s, size_t length )
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: m_begin( s ), m_end( m_begin + length ) { if( length == 0 ) erase(); }
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const_string( char const* first, char const* last )
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: m_begin( first ), m_end( last ) {}
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// data access methods
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char operator[]( size_t index ) const { return m_begin[index]; }
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char at( size_t index ) const { return m_begin[index]; }
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char const* data() const { return m_begin; }
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// length operators
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size_t length() const { return m_end - m_begin; }
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bool is_empty() const { return m_end == m_begin; }
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void erase() { m_begin = m_end = ""; }
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void resize( size_t new_len ) { if( m_begin + new_len < m_end ) m_end = m_begin + new_len; }
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void rshorten( size_t shift = 1 ) { m_end -= shift; if( m_end <= m_begin ) erase(); }
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void lshorten( size_t shift = 1 ) { m_begin += shift; if( m_end <= m_begin ) erase(); }
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// Assignment operators
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const_string& operator=( const_string const& s );
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const_string& operator=( string const& s ) { return *this = const_string( s ); }
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const_string& operator=( char const* s ) { return *this = const_string( s ); }
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const_string& assign( const_string const& s ) { return *this = s; }
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const_string& assign( string const& s, size_t len ) { return *this = const_string( s.data(), len ); }
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const_string& assign( string const& s ) { return *this = const_string( s ); }
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const_string& assign( char const* s ) { return *this = const_string( s ); }
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const_string& assign( char const* s, size_t len ) { return *this = const_string( s, len ); }
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const_string& assign( char const* f, char const* l ) { return *this = const_string( f, l ); }
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void swap( const_string& s ) {
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// do not want to include alogrithm
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char const* tmp1 = m_begin;
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char const* tmp2 = m_end;
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m_begin = s.m_begin;
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m_end = s.m_end;
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s.m_begin = tmp1;
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s.m_end = tmp2;
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}
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// Comparison operators
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friend bool operator==( const_string const& s1, const_string const& s2 )
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{
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return s1.length() == s2.length() && std::strncmp( s1.data(), s2.data(), s1.length() ) == 0;
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}
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friend bool operator==( const_string const& s1, char const* s2 ) { return s1 == const_string( s2 ); }
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friend bool operator==( const_string const& s1, const string& s2 ) { return s1 == const_string( s2 ); }
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friend bool operator!=( const_string const& s1, const_string const& s2 ) { return !(s1 == s2); }
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friend bool operator!=( const_string const& s1, char const* s2 ) { return !(s1 == s2); }
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friend bool operator!=( const_string const& s1, const string& s2 ) { return !(s1 == s2); }
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friend bool operator==( char const* s2, const_string const& s1 ) { return s1 == s2; }
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friend bool operator==( const string& s2, const_string const& s1 ) { return s1 == s2; }
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friend bool operator!=( char const* s2, const_string const& s1 ) { return !(s1 == s2); }
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friend bool operator!=( const string& s2, const_string const& s1 ) { return !(s1 == s2); }
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// Iterators
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iterator begin() const { return m_begin; }
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iterator end() const { return m_end; }
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reverse_iterator rbegin() const { return reverse_iterator( m_end ); }
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reverse_iterator rend() const { return reverse_iterator( m_begin ); }
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private:
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// Data members
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char const* m_begin;
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char const* m_end;
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};
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//____________________________________________________________________________//
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// first character
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class first_char {
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public:
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char operator()( const_string source, char default_char = '\0' ) const {
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return source.is_empty() ? default_char : *source.data();
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}
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};
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//____________________________________________________________________________//
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// last character
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class last_char {
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public:
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char operator()( const_string source, char default_char = '\0' ) const {
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return source.is_empty() ? default_char : *source.rbegin();
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}
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};
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//____________________________________________________________________________//
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inline const_string&
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const_string::operator=( const_string const& s ) {
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if( &s != this ) {
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m_begin = s.m_begin;
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m_end = s.m_end;
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}
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return *this;
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}
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//____________________________________________________________________________//
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typedef const_string const literal;
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//____________________________________________________________________________//
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inline std::ostream&
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operator<<( std::ostream& os, const_string const& str )
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{
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os << std::string( str.begin(), str.length() );
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return os;
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}
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//____________________________________________________________________________//
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}; // namespace common_layer
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#endif // CONST_STRING_HPP
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