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// file : libbuild2/prerequisite-key.hxx -*- C++ -*-
// license : MIT; see accompanying LICENSE file
#ifndef LIBBUILD2_PREREQUISITE_KEY_HXX
#define LIBBUILD2_PREREQUISITE_KEY_HXX
#include <libbuild2/types.hxx>
#include <libbuild2/forward.hxx>
#include <libbuild2/utility.hxx>
#include <libbuild2/target-key.hxx>
#include <libbuild2/target-type.hxx>
#include <libbuild2/export.hxx>
namespace build2
{
// Light-weight (by being shallow-pointing) prerequisite key, similar
// to (and based on) target key.
//
// Note that unlike prerequisite, the key is not (necessarily) owned by a
// target. So for the key we instead have the base scope of the target that
// (would) own it. Note that we assume keys to be ephemeral enough for the
// base scope to remain unchanged.
//
class prerequisite_key
{
public:
using scope_type = build2::scope;
const optional<project_name>& proj;
target_key tk; // The .dir and .out members can be relative.
const scope_type* scope; // Can be NULL if tk.dir is absolute.
template <typename T>
bool is_a () const {return tk.is_a<T> ();}
bool is_a (const target_type& tt) const {return tk.is_a (tt);}
};
LIBBUILD2_SYMEXPORT ostream&
operator<< (ostream&, const prerequisite_key&);
}
#endif // LIBBUILD2_PREREQUISITE_KEY_HXX
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