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
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
//
// Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/boostorg/json
//
#include <boost/json/monotonic_resource.hpp>
#include <boost/json/parse.hpp>
#include <boost/json/static_resource.hpp>
#include <boost/json/storage_ptr.hpp>
#include <boost/json/value.hpp>
#include <iostream>
#include "test_suite.hpp"
namespace boost {
namespace json {
//----------------------------------------------------------
static void set1() {
//----------------------------------------------------------
{
// tag::doc_storage_ptr_1[]
storage_ptr sp1;
storage_ptr sp2;
assert( sp1.get() != nullptr ); // always points to a valid resource
assert( sp1.get() == sp2.get() ); // both point to the default resource
assert( *sp1.get() == *sp2.get() ); // the default resource compares equal
// end::doc_storage_ptr_1[]
}
//----------------------------------------------------------
{
// tag::doc_storage_ptr_2[]
array arr; // default construction
object obj;
string str;
value jv;
assert( jv.storage().get() == storage_ptr().get() ); // uses the default memory resource
assert( jv.storage().get() == arr.storage().get() ); // both point to the default resource
assert( *arr.storage() == *obj.storage() ); // containers use equivalent resources
// end::doc_storage_ptr_2[]
}
//----------------------------------------------------------
{
// tag::doc_storage_ptr_3[]
monotonic_resource mr;
value const jv = parse( "[1,2,3]", &mr );
// end::doc_storage_ptr_3[]
}
//----------------------------------------------------------
} // set1
//----------------------------------------------------------
// tag::doc_storage_ptr_4[]
value parse_value( string_view s)
{
return parse( s, make_shared_resource< monotonic_resource >() );
}
// end::doc_storage_ptr_4[]
//----------------------------------------------------------
// tag::doc_storage_ptr_5[]
template< class Handler >
void do_rpc( string_view s, Handler&& h )
{
unsigned char buffer[ 8192 ]; // Small stack buffer to avoid most allocations during parse
monotonic_resource mr( buffer ); // This resource will use our local buffer first
value const jv = parse( s, &mr ); // Parse the input string into a value that uses our resource
h( jv ); // Call the handler to perform the RPC command
}
// end::doc_storage_ptr_5[]
//----------------------------------------------------------
void set2() {
//----------------------------------------------------------
{
// tag::doc_storage_ptr_6[]
unsigned char buffer[ 8192 ];
static_resource mr( buffer ); // The resource will use our local buffer
// end::doc_storage_ptr_6[]
}
//----------------------------------------------------------
{
// tag::doc_storage_ptr_7[]
monotonic_resource mr;
array arr( &mr ); // construct an array using our resource
arr.emplace_back( "boost" ); // insert a string
assert( *arr[0].as_string().storage() == mr ); // the resource is propagated to the string
// end::doc_storage_ptr_7[]
}
//----------------------------------------------------------
{
// tag::doc_storage_ptr_8[]
{
monotonic_resource mr;
array arr( &mr ); // construct an array using our resource
assert( ! arr.storage().is_shared() ); // no shared ownership
}
// end::doc_storage_ptr_8[]
}
//----------------------------------------------------------
{
// tag::doc_storage_ptr_9[]
storage_ptr sp = make_shared_resource< monotonic_resource >();
string str( sp );
assert( sp.is_shared() ); // shared ownership
assert( str.storage().is_shared() ); // shared ownership
// end::doc_storage_ptr_9[]
}
//----------------------------------------------------------
} // set2
//----------------------------------------------------------
// tag::doc_storage_ptr_10[]
class logging_resource : public boost::container::pmr::memory_resource
{
private:
void* do_allocate( std::size_t bytes, std::size_t align ) override
{
std::cout << "Allocating " << bytes << " bytes with alignment " << align << '\n';
return ::operator new( bytes );
}
void do_deallocate( void* ptr, std::size_t bytes, std::size_t align ) override
{
std::cout << "Deallocating " << bytes << " bytes with alignment " << align << " @ address " << ptr << '\n';
return ::operator delete( ptr );
}
bool do_is_equal( memory_resource const& other ) const noexcept override
{
// since the global allocation and deallocation functions are used,
// any instance of a logging_resource can deallocate memory allocated
// by another instance of a logging_resource
return dynamic_cast< logging_resource const* >( &other ) != nullptr;
}
};
// end::doc_storage_ptr_10[]
//----------------------------------------------------------
class doc_storage_ptr_test
{
public:
void
run()
{
(void)&set1;
BOOST_TEST_PASS();
}
};
TEST_SUITE(doc_storage_ptr_test, "boost.json.doc_storage_ptr");
} // namespace json
} // namespace boost
|
