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// file : build/prerequisite -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef BUILD_PREREQUISITE
#define BUILD_PREREQUISITE
#include <set>
#include <string>
#include <iosfwd>
#include <utility> // move
#include <cassert>
#include <typeindex>
#include <functional> // reference_wrapper
#include <build/path>
#include <build/target-key>
#include <build/utility> // extension_pool
#include <build/diagnostics>
namespace build
{
class scope;
class target;
// Light-weight (by being shallow-pointing) prerequisite key, similar
// to (and based on) target key.
//
class prerequisite_key
{
public:
typedef build::scope scope_type;
target_key tk;
mutable scope_type* scope; // Can be NULL if tk.dir is absolute.
};
inline bool
operator< (const prerequisite_key& x, const prerequisite_key& y)
{
assert (x.scope == y.scope);
return x.tk < y.tk;
}
std::ostream&
operator<< (std::ostream&, const prerequisite_key&);
class prerequisite
{
public:
typedef build::target target_type;
typedef build::target_type target_type_type;
typedef build::scope scope_type;
prerequisite (const target_type_type& t,
dir_path d,
std::string n,
const std::string* e,
scope_type& s)
: type (t), dir (std::move (d)), name (std::move (n)), ext (e),
scope (s), target (nullptr) {}
public:
const target_type_type& type;
const dir_path dir; // Normalized absolute or relative (to scope).
const std::string name;
const std::string* ext; // NULL if unspecified.
scope_type& scope;
target_type* target; // NULL if not yet resolved. Note that this should
// always be the "primary target", not a member of
// a target group.
public:
// Prerequisite (target) type.
//
template <typename T>
bool
is_a () const {return type.id == typeid (T);}
};
inline bool
operator< (const prerequisite& x, const prerequisite& y)
{
return prerequisite_key {{&x.type, &x.dir, &x.name, &x.ext}, &x.scope} <
prerequisite_key {{&y.type, &y.dir, &y.name, &y.ext}, &y.scope};
}
inline std::ostream&
operator<< (std::ostream& os, const prerequisite& p)
{
return os <<
prerequisite_key {{&p.type, &p.dir, &p.name, &p.ext}, &p.scope};
}
// Set of prerequisites in a scope.
//
struct prerequisite_set: std::set<prerequisite>
{
std::pair<prerequisite&, bool>
insert (const target_type&,
dir_path dir,
std::string name,
const std::string* ext,
scope&,
tracer&);
};
}
#endif // BUILD_PREREQUISITE
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