1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
// file : build2/target-type -*- C++ -*-
// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef BUILD2_TARGET_TYPE
#define BUILD2_TARGET_TYPE
#include <map>
#include <build2/types>
#include <build2/utility>
namespace build2
{
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.
//
// If the extension derivation function is NULL, then it means this target
// type does not use extensions. Note that this is relied upon when deciding
// whether to print the extension; if the target does use extensions but the
// defaults could not (and its ok), could not (and its not ok), or should not
// (logically) be obtained, then use target_extension_{null,fail,assert}(),
// respectively. If the extension function returns NULL, then that means the
// default extension for this target could not be derived.
//
// The extension function is used in two places: search_existing_file() and
// in target::derive_path(); see their implementations for details.
//
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&);
void (*print) (ostream&, const target_key&);
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 ostream&
operator<< (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 // BUILD2_TARGET_TYPE
|