#pragma once

struct cfa_option {
      char short_name;
      const char * long_name;
      const char * help;
      void * variable;
      bool (*parse)(const char *, void * );
};

extern cfa_option last_option;

static inline void ?{}( cfa_option & this ) {}

forall(dtype T | { bool parse(const char *, T & ); })
static inline void ?{}( cfa_option & this, char short_name, const char * long_name, const char * help, T & variable ) {
      this.short_name = short_name;
      this.long_name  = long_name;
      this.help       = help;
      this.variable   = (void*)&variable;
      this.parse      = (bool (*)(const char *, void * ))parse;
}

forall(dtype T)
static inline void ?{}( cfa_option & this, char short_name, const char * long_name, const char * help, T & variable, bool (*parse)(const char *, T & )) {
      this.short_name = short_name;
      this.long_name  = long_name;
      this.help       = help;
      this.variable   = (void*)&variable;
      this.parse      = (bool (*)(const char *, void * ))parse;
}

void parse_args( cfa_option options[], size_t opt_count, const char * usage, char ** & left );
void parse_args( int argc, char * argv[], cfa_option options[], size_t opt_count, const char * usage, char ** & left );

void print_args_usage(cfa_option options[], size_t opt_count, const char * usage, bool error)  __attribute__ ((noreturn));
void print_args_usage(int argc, char * argv[], cfa_option options[], size_t opt_count, const char * usage, bool error)  __attribute__ ((noreturn));

bool parse_yesno   (const char *, bool & );
bool parse_settrue (const char *, bool & );
bool parse_setfalse(const char *, bool & );

bool parse(const char *, const char * & );
bool parse(const char *, int & );
bool parse(const char *, unsigned & );
bool parse(const char *, unsigned long & );
bool parse(const char *, unsigned long long & );
bool parse(const char *, double & );