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//: :require.h

// Test for error conditions in programs

// Local "using namespace std" for old compilers

#ifndef REQUIRE_H

#define REQUIRE_H

#include <cstdio>

#include <cstdlib>

#include <fstream>

#include <string>

inline void require(bool requirement,

  const std::string& msg = "Requirement failed"){

  using namespace std;

  if (!requirement) {

    fputs(msg.c_str(), stderr);

    fputs("\n", stderr);

    exit(1);

  }

}

inline void verify(bool requirement,

  const std::string& msg = "Requirement failed"){

  using namespace std;

  if (!requirement) {

    fputs(msg.c_str(), stdout);

    fputs("\n", stdout);

  }

}

inline void requireArgs(int argc, int args,

  const std::string& msg =

    "Must use %d arguments") {

  using namespace std;

   if (argc != args + 1) {

     fprintf(stderr, msg.c_str(), args);

     fputs("\n", stderr);

     exit(1);

   }

}

inline void requireMinArgs(int argc, int minArgs,

  const std::string& msg =

    "Must use at least %d arguments") {

  using namespace std;

  if(argc < minArgs + 1) {

    fprintf(stderr, msg.c_str(), minArgs);

    fputs("\n", stderr);

    exit(1);

  }

}

inline void assure(std::ifstream& in,

  const std::string& filename = "") {

  using namespace std;

  if(!in) {

    fprintf(stderr, "Could not open file %s\n",

      filename.c_str());

    exit(1);

  }

}

inline void assure(std::ofstream& out,

  const std::string& filename = "") {

  using namespace std;

  if(!out) {

    fprintf(stderr, "Could not open file %s\n",

      filename.c_str());

    exit(1);

  }

}

#endif // REQUIRE_H ///:~