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// file : libbuild2/recipe.hxx -*- C++ -*-
// license : MIT; see accompanying LICENSE file
#ifndef LIBBUILD2_RECIPE_HXX
#define LIBBUILD2_RECIPE_HXX
#include <libbuild2/types.hxx>
#include <libbuild2/forward.hxx>
#include <libbuild2/utility.hxx>
#include <libbuild2/action.hxx>
#include <libbuild2/target-state.hxx>
#include <libbuild2/export.hxx>
namespace build2
{
// The returned target state is normally changed or unchanged. If there is
// an error, then the recipe should throw failed rather than returning (this
// is the only exception that a recipe can throw).
//
// The return value of the recipe is used to update the target state. If it
// is target_state::group then the target's state is the group's state.
//
// The recipe may also return postponed in which case the target state is
// assumed to be unchanged (normally this means a prerequisite was postponed
// and while the prerequisite will be re-examined via another dependency,
// this target is done).
//
// Note that max size for the "small size optimization" in std::function
// (which is what move_only_function_ex is based on) ranges (in pointer
// sizes) from 0 (GCC libstdc++ prior to 5) to 2 (GCC 5 and later) to 3
// (Clang libc++) to 6 (VC 14.2). With the size ranging (in bytes for 64-bit
// target) from 32 (GCC) to 64 (VC).
//
using recipe_function = target_state (action, const target&);
using recipe = move_only_function_ex<recipe_function>;
// Commonly-used recipes.
//
// The default recipe executes the action on all the prerequisites in a
// loop, skipping ignored. Specifically, for actions with the "first"
// execution mode, it calls execute_prerequisites() while for those with
// "last" -- reverse_execute_prerequisites() (see <libbuild2/operation.hxx>,
// <libbuild2/algorithm.hxx> for details). The group recipe calls the
// group's recipe.
//
LIBBUILD2_SYMEXPORT extern recipe_function* const empty_recipe;
LIBBUILD2_SYMEXPORT extern recipe_function* const noop_recipe;
LIBBUILD2_SYMEXPORT extern recipe_function* const default_recipe;
LIBBUILD2_SYMEXPORT extern recipe_function* const group_recipe;
}
#endif // LIBBUILD2_RECIPE_HXX
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