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-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- S Y S T E M . S P A R K . C U T _ O P E R A T I O N S --
--- --
--- S p e c --
--- --
--- Copyright (C) 2022-2025, Free Software Foundation, Inc. --
--- --
--- GNAT is free software; you can redistribute it and/or modify it under --
--- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 3, or (at your option) any later ver- --
--- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE. --
--- --
--- As a special exception under Section 7 of GPL version 3, you are granted --
--- additional permissions described in the GCC Runtime Library Exception, --
--- version 3.1, as published by the Free Software Foundation. --
--- --
--- You should have received a copy of the GNU General Public License and --
--- a copy of the GCC Runtime Library Exception along with this program; --
--- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
--- <http://www.gnu.org/licenses/>. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
--- This package provides connectors used to manually help the proof of
--- assertions by introducing intermediate steps. They can only be used inside
--- pragmas Assert or Assert_And_Cut.
-
-package System.SPARK.Cut_Operations with
- SPARK_Mode,
- Pure,
- Always_Terminates
-is
-
- function By (Consequence, Premise : Boolean) return Boolean with
- Ghost,
- Global => null;
- -- If A and B are two boolean expressions, proving By (A, B) requires
- -- proving B, the premise, and then A assuming B, the side-condition. When
- -- By (A, B) is assumed on the other hand, we only assume A. B is used
- -- for the proof, but is not visible afterward.
-
- function So (Premise, Consequence : Boolean) return Boolean with
- Ghost,
- Global => null;
- -- If A and B are two boolean expressions, proving So (A, B) requires
- -- proving A, the premise, and then B assuming A, the side-condition. When
- -- So (A, B) is assumed both A and B are assumed to be true.
-
-end System.SPARK.Cut_Operations;