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game/shared/gamestringpool.h

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+//========= Copyright <20> 1996-2005, Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Pool of all per-level strings. Allocates memory for strings, 
+//			consolodating duplicates. The memory is freed on behalf of clients
+//			at level transition. Strings are of type string_t.
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef GAMESTRINGPOOL_H
+#define GAMESTRINGPOOL_H
+
+#if defined( _WIN32 )
+#pragma once
+#endif
+
+#if !defined( GC )
+class IGameSystem;
+#endif
+
+//-----------------------------------------------------------------------------
+// String allocation
+//-----------------------------------------------------------------------------
+string_t AllocPooledString( const char *pszValue );
+#define AllocPooledStringConstant( pszValue ) AllocPooledString( pszValue )
+string_t FindPooledString( const char *pszValue );
+void RemovePooledString( const char *pszValue );
+
+#define AssertIsValidString( s )	AssertMsg( s == NULL_STRING || s == FindPooledString( STRING(s) ), "Invalid string " #s );
+		 
+//-----------------------------------------------------------------------------
+// String system accessor
+//-----------------------------------------------------------------------------
+#if !defined( GC )
+IGameSystem *GameStringSystem();
+#endif
+
+//-----------------------------------------------------------------------------
+class CGameString
+{
+public:
+	CGameString() : 
+		m_iszString( NULL_STRING ), m_pszString( NULL ), m_iSerial( 0 ) 
+	{
+
+	} 
+
+	CGameString( const char *pszString, bool bCopy = false )  : 
+		m_iszString( NULL_STRING ), m_pszString( NULL ), m_iSerial( 0 ) 
+	{ 
+		Set( pszString, bCopy ); 
+	}
+
+	~CGameString() 
+	{ 
+		if ( m_bCopy ) 
+			free( (void *)m_pszString ); 
+	}
+
+	void Set( const char *pszString, bool bCopy = false )
+	{
+		if ( m_bCopy && m_pszString )
+			free( (void *)m_pszString );
+		m_iszString = NULL_STRING;
+		m_pszString = ( !bCopy ) ? pszString : strdup( pszString );
+	}
+
+	// This is only for temp variables!
+	// If the global string pool changes this has no way to realloc the string!
+	void SetFastNoCopy( string_t iszString )
+	{
+		m_iszString = iszString;
+		m_iSerial = gm_iSerialNumber;
+	}
+
+	bool IsSerialNumberOutOfDate( void ) const
+	{
+		return m_iSerial != gm_iSerialNumber;
+	}
+
+	string_t Get() const
+	{
+		if ( m_iszString == NULL_STRING || IsSerialNumberOutOfDate() )
+		{
+			if ( !m_pszString )
+				return NULL_STRING;
+
+			m_iszString = AllocPooledString( m_pszString );
+			m_iSerial = gm_iSerialNumber;
+		}
+
+		return m_iszString;
+	}
+
+	operator const char *() const
+	{
+		return ( m_pszString ) ? m_pszString : "";
+	}
+
+#ifndef NO_STRING_T
+	operator string_t() const
+	{
+		return Get();
+	}
+#endif
+
+	static void IncrementSerialNumber()
+	{
+		gm_iSerialNumber++;
+	}
+
+private:
+	mutable string_t m_iszString;
+	const char *m_pszString;
+	mutable int m_iSerial;
+	bool m_bCopy;
+
+
+	static int gm_iSerialNumber;
+
+};
+
+#endif // GAMESTRINGPOOL_H