root/mylib/trunk/rconfig/rconfig.h

/* $Id$ $URL$ */
#ifndef RCONFIG_DOT_AITCH
#define RCONFIG_DOT_AITCH
/**\file rconfig.h
 * \ingroup coreheaders
 * Declarations of the configuration variables go here, within the RConfig
 * namespace.
 * \author Trent Apted <tapted@it.usyd.edu.au>
 * $Revision$
 * $Date$
 */

#include <stdlib.h>
#include <string>
#include <vector>

/** The readable configuration parser handle */
class RCParser {
    int argc;    ///< main()'s argc
    char **argv; ///< main()'s argv
    char **envv; ///< main()'s envv, if present
public:
    /** Construct the RCParser, with arguments from main() */
    RCParser(int argc, char** argv, char** envv = 0);
    /** Get the argc, from main() */
    int getArgc() const;
    /** Get argv[], from main() */
    char* const * getArgv() const;
    /** get envv[], from main(), NULL if not present */
    char* const * getEnvv() const;
};

/**
 * Configuration variables are kept in the RConfig namespace.
 */

namespace RConfig {

/**
 * Parse a readable configuration file
 */
int rcfile_parse(const char* file = "sharepicrc");

/**
 * Parse a line of configuration
 */
bool rcfile_parseline(const std::string& line);

/**
 * Get the names of stored variables
 */
void rcfile_getnames(std::vector<std::string> & names);

/**
 * Get the string value of a stored variable if stored
 */
bool rcfile_getvalue(std::string& val, const std::string& name);

//@{
/**
 * Tell the RCFile parser to look for config vars of \a name to store in \a ref
 */
void rcfile_tell(const char* name, bool &ref, const char* context = 0);
void rcfile_tell(const char* name, int &ref, const char* context = 0); 
void rcfile_tell(const char* name, float &ref, const char* context = 0);
void rcfile_tell(const char* name, double &ref, const char* context = 0);
void rcfile_tell(const char* name, unsigned &ref, const char* context = 0);
void rcfile_tell(const char* name, std::string &ref, const char* context = 0);
void rcfile_tellstr(const char* name, std::string &ref, const char* defval = 0, const char* context = 0);
//void rcfile_tell(const char* name, std::vector<bool> &ref);
void rcfile_tell(const char* name, std::vector<int> &ref, const char* context = 0);
void rcfile_tell(const char* name, std::vector<float> &ref, const char* context = 0);
void rcfile_tell(const char* name, std::vector<double> &ref, const char* context = 0);
void rcfile_tell(const char* name, std::vector<unsigned> &ref, const char* context = 0);
void rcfile_tell(const char* name, std::vector<std::string> &ref, const char* context = 0);
//@}

template<class T, class V>
    T rcfile_initwrap(const char* name, T& ref, const V& initval, const char* context = 0) {
        ref = initval; //this only works for primitive types
        rcfile_tell(name, ref, context);
        return initval;
    }

template<class V>
    std::string rcfile_initwrap(const char* name, std::string& ref, const V& initval, const char* context = 0) {
        rcfile_tellstr(name, ref, initval, context);
        return initval;
    }

/**\internal RConfig Initialiser */
struct Init {static int count; Init(); ~Init();};
}
namespace {
    /**\internal Guarantee initialisation regardless of linking order */
    RConfig::Init rconfig_init__;
}

/** If the variable has the same name as the config parameter, you can use this macro */
#define RCFILE_TELLMACRO(_var) RConfig::rcfile_tell( #_var, _var, __FILE__ )
#define RCFILE_CONFIGVAR(_var, _default) _var = RConfig::rcfile_initwrap(#_var, _var, _default, __FILE__)

#endif