author | truelight |
Sat, 14 Jul 2007 20:21:02 +0000 | |
changeset 7254 | 8d62cdb9a120 |
parent 7193 | d46cbf314baf |
child 7318 | 632cd0497770 |
permissions | -rw-r--r-- |
2186 | 1 |
/* $Id$ */ |
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/** @file driver.h */ |
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#ifndef DRIVER_H |
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#define DRIVER_H |
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#include "debug.h" |
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#include "helpers.hpp" |
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#include "string.h" |
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#include <string> |
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#include <map> |
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bool GetDriverParamBool(const char* const* parm, const char* name); |
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int GetDriverParamInt(const char* const* parm, const char* name, int def); |
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class Driver { |
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public: |
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virtual const char *Start(const char * const *parm) = 0; |
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virtual void Stop() = 0; |
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virtual ~Driver() { } |
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enum Type { |
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DT_BEGIN = 0, |
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DT_SOUND = 0, |
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DT_MUSIC, |
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DT_VIDEO, |
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DT_END, |
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}; |
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}; |
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DECLARE_POSTFIX_INCREMENT(Driver::Type); |
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class DriverFactoryBase { |
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private: |
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Driver::Type type; |
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char *name; |
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int priority; |
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typedef std::map<std::string, DriverFactoryBase *> Drivers; |
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static Drivers &GetDrivers() |
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{ |
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static Drivers &s_drivers = *new Drivers(); |
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return s_drivers; |
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} |
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static Driver **GetActiveDriver(Driver::Type type) |
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{ |
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static Driver *s_driver[3] = { NULL, NULL, NULL }; |
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return &s_driver[type]; |
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} |
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static const char *GetDriverTypeName(Driver::Type type) |
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{ |
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static const char *driver_type_name[] = { "sound", "music", "video" }; |
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return driver_type_name[type]; |
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} |
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protected: |
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/** |
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* Register a driver internally, based on its name. |
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* @param name the name of the driver. |
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* @note an assert() will be trigger if 2 driver with the same name try to register. |
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*/ |
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void RegisterDriver(const char *name, Driver::Type type, int priority) |
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{ |
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/* Don't register nameless Drivers */ |
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if (name == NULL) return; |
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this->name = strdup(name); |
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this->type = type; |
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this->priority = priority; |
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/* Prefix the name with driver type to make it unique */ |
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char buf[32]; |
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strecpy(buf, GetDriverTypeName(type), lastof(buf)); |
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strecpy(buf + 5, name, lastof(buf)); |
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#if !defined(NDEBUG) |
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/* NDEBUG disables asserts and gives a warning: unused variable 'P' */ |
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std::pair<Drivers::iterator, bool> P = |
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#endif /* !NDEBUG */ |
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GetDrivers().insert(Drivers::value_type(buf, this)); |
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assert(P.second); |
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} |
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public: |
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DriverFactoryBase() : |
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name(NULL) |
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{} |
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virtual ~DriverFactoryBase() { if (this->name != NULL) GetDrivers().erase(this->name); free(this->name); } |
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/** |
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* Find the requested driver and return its class. |
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* @param name the driver to select. |
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* @post Sets the driver so GetCurrentDriver() returns it too. |
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*/ |
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static Driver *SelectDriver(const char *name, Driver::Type type) |
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{ |
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if (GetDrivers().size() == 0) return NULL; |
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105 |
|
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if (*name == '\0') { |
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/* Probe for this driver */ |
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for (int priority = 10; priority >= 0; priority--) { |
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Drivers::iterator it = GetDrivers().begin(); |
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for (; it != GetDrivers().end(); ++it) { |
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DriverFactoryBase *d = (*it).second; |
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112 |
|
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/* Check driver type */ |
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if (d->type != type) continue; |
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if (d->priority != priority) continue; |
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116 |
|
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Driver *newd = d->CreateInstance(); |
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const char *err = newd->Start(NULL); |
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if (err == NULL) { |
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DEBUG(driver, 1, "Successfully probed %s driver '%s'", GetDriverTypeName(type), d->name); |
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delete *GetActiveDriver(type); |
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*GetActiveDriver(type) = newd; |
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return newd; |
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124 |
} |
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125 |
|
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DEBUG(driver, 1, "Probing %s driver '%s' failed with error: %s", GetDriverTypeName(type), d->name, err); |
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delete newd; |
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128 |
} |
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} |
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error("Couldn't find any suitable %s driver", GetDriverTypeName(type)); |
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} else { |
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char *parm; |
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char buffer[256]; |
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const char *parms[32]; |
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135 |
|
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/* Extract the driver name and put parameter list in parm */ |
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strecpy(buffer, name, lastof(buffer)); |
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parm = strchr(buffer, ':'); |
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parms[0] = NULL; |
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if (parm != NULL) { |
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141 |
uint np = 0; |
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142 |
/* Tokenize the parm. */ |
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143 |
do { |
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144 |
*parm++ = '\0'; |
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145 |
if (np < lengthof(parms) - 1) |
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parms[np++] = parm; |
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147 |
while (*parm != '\0' && *parm != ',') |
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parm++; |
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149 |
} while (*parm == ','); |
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parms[np] = NULL; |
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151 |
} |
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152 |
|
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153 |
/* Find this driver */ |
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154 |
Drivers::iterator it = GetDrivers().begin(); |
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155 |
for (; it != GetDrivers().end(); ++it) { |
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156 |
DriverFactoryBase *d = (*it).second; |
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157 |
|
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158 |
/* Check driver type */ |
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159 |
if (d->type != type) continue; |
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160 |
|
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161 |
/* Check driver name */ |
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162 |
if (strcasecmp(buffer, d->name) != 0) continue; |
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163 |
|
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164 |
/* Found our driver, let's try it */ |
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165 |
Driver *newd = d->CreateInstance(); |
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166 |
|
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167 |
const char *err = newd->Start(parms); |
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168 |
if (err != NULL) { |
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169 |
delete newd; |
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170 |
error("Unable to load driver '%s'. The error was: %s", d->name, err); |
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171 |
} |
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172 |
|
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173 |
DEBUG(driver, 1, "Successfully loaded %s driver '%s'", GetDriverTypeName(type), d->name); |
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174 |
delete *GetActiveDriver(type); |
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175 |
*GetActiveDriver(type) = newd; |
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176 |
return newd; |
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177 |
} |
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178 |
error("No such %s driver: %s\n", GetDriverTypeName(type), buffer); |
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179 |
} |
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180 |
} |
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181 |
|
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182 |
/** |
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183 |
* Build a human readable list of available drivers, grouped by type. |
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184 |
*/ |
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185 |
static char *GetDriversInfo(char *p, const char *last) |
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186 |
{ |
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187 |
for (Driver::Type type = Driver::DT_BEGIN; type != Driver::DT_END; type++) { |
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188 |
p += snprintf(p, last - p, "List of %s drivers:\n", GetDriverTypeName(type)); |
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189 |
|
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190 |
for (int priority = 10; priority >= 0; priority--) { |
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191 |
Drivers::iterator it = GetDrivers().begin(); |
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192 |
for (; it != GetDrivers().end(); it++) { |
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193 |
DriverFactoryBase *d = (*it).second; |
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194 |
if (d->type != type) continue; |
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if (d->priority != priority) continue; |
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p += snprintf(p, last - p, "%18s: %s\n", d->name, d->GetDescription()); |
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} |
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} |
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|
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p += snprintf(p, last - p, "\n"); |
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} |
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|
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return p; |
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} |
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|
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/** |
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* Get a nice description of the driver-class. |
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*/ |
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virtual const char *GetDescription() = 0; |
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|
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/** |
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* Create an instance of this driver-class. |
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*/ |
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virtual Driver *CreateInstance() = 0; |
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}; |
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#endif /* DRIVER_H */ |