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-/*
- * Programming by Contract is a programming methodology
- * which binds the caller and the function called to a
- * contract. The contract is represented using Hoare Triple:
- *      {P} C {Q}
- * where {P} is the precondition before executing command C,
- * and {Q} is the postcondition.
- *
- * See also:
- * http://en.wikipedia.org/wiki/Design_by_contract
- * http://en.wikipedia.org/wiki/Hoare_logic
- * http://dlang.org/dbc.html
- */
-
-#ifndef PBC_H_
-#define PBC_H_
-
-#include <assert.h>
-
-/*
- * Checks caller responsibility against contract
- */
-#define REQUIRE(cond) assert(cond)
-
-/*
- * Checks function reponsability against contract.
- */
-#define ENSURE(cond) assert(cond)
-
-/*
- * While REQUIRE and ENSURE apply to functions, INVARIANT
- * applies to classes/structs.  It ensures that intances
- * of the class/struct are consistent. In other words,
- * that the instance has not been corrupted.
- */
-#define INVARIANT(invariant_fnc) do{ (invariant_fnc) } while (0);
-
-#else
-#define REQUIRE(cond) do { } while (0);
-#define ENSURE(cond) do { } while (0);
-#define INVARIANT(invariant_fnc) do{ } while (0);
-
-#endif /* PBC_H_ */
-
-
-/*
-
-This is an _extremely_ simple example:
-
-int divide (int n, int d)
-{
-    int ans;
-
-    REQUIRE(d != 0);
-
-    ans = n / d;
-
-    // As code is added to this function throughout its lifetime,
-    // ENSURE will assert that data will be returned
-    // according to the contract.  Again this is an
-    // extremely simple example. :-D
-    ENSURE( ans == (n / d) );
-
-    return ans;
-}
-
-*/