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// file : build/target-type -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef BUILD_TARGET_TYPE
#define BUILD_TARGET_TYPE
#include <map>
#include <string>
#include <ostream>
#include <build/types>
namespace build
{
class scope;
class target;
class target_key;
class prerequisite_key;
// Target type.
//
// Note that we assume there is always a single instance of this class
// for any target type. As a result, we can use address comparison to
// determine if two target types are the same.
//
//
struct target_type
{
const char* name;
const target_type* base;
target* (*factory) (const target_type&, dir_path, string, const string*);
const string& (*extension) (const target_key&, scope&);
target* (*search) (const prerequisite_key&);
bool see_through; // A group with the default "see through" semantics.
bool
is_a (const target_type&) const; // Defined in target.cxx
template <typename T>
bool
is_a () const {return is_a (T::static_type);}
};
inline bool
operator< (const target_type& x, const target_type& y) {return &x < &y;}
inline bool
operator== (const target_type& x, const target_type& y) {return &x == &y;}
inline bool
operator!= (const target_type& x, const target_type& y) {return &x != &y;}
inline std::ostream&
operator<< (std::ostream& os, const target_type& tt) {return os << tt.name;}
// Target type map.
//
struct target_type_ref
{
// Like reference_wrapper except it sometimes deletes the target type.
//
explicit
target_type_ref (const target_type& r): p_ (&r), d_ (false) {}
explicit
target_type_ref (unique_ptr<target_type>&& p)
: p_ (p.release ()), d_ (true) {}
target_type_ref (target_type_ref&& r)
: p_ (r.p_), d_ (r.d_) {r.p_ = nullptr;}
~target_type_ref () {if (p_ != nullptr && d_) delete p_;}
explicit operator const target_type& () const {return *p_;}
const target_type& get () const {return *p_;}
private:
const target_type* p_;
bool d_;
};
using target_type_map_base = std::map<string, target_type_ref>;
class target_type_map: public target_type_map_base
{
public:
void
insert (const target_type& tt) {emplace (tt.name, target_type_ref (tt));}
template <typename T>
void
insert () {insert (T::static_type);}
};
}
#endif // BUILD_TARGET_TYPE
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