1   
//
1   
//
2   
// Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
2   
// Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
3   
//
3   
//
4   
// Distributed under the Boost Software License, Version 1.0. (See accompanying
4   
// Distributed under the Boost Software License, Version 1.0. (See accompanying
5   
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
5   
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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//
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// Official repository: https://github.com/boostorg/json
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// Official repository: https://github.com/boostorg/json
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//
8   
//
9  
9  
10   
#ifndef BOOST_JSON_DETAIL_VALUE_HPP
10   
#ifndef BOOST_JSON_DETAIL_VALUE_HPP
11   
#define BOOST_JSON_DETAIL_VALUE_HPP
11   
#define BOOST_JSON_DETAIL_VALUE_HPP
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12  
13   
#include <boost/json/fwd.hpp>
13   
#include <boost/json/fwd.hpp>
14   
#include <boost/json/kind.hpp>
14   
#include <boost/json/kind.hpp>
15   
#include <boost/json/storage_ptr.hpp>
15   
#include <boost/json/storage_ptr.hpp>
16   
#include <cstdint>
16   
#include <cstdint>
17   
#include <limits>
17   
#include <limits>
18   
#include <new>
18   
#include <new>
19   
#include <utility>
19   
#include <utility>
20  
20  
21   
namespace boost {
21   
namespace boost {
22   
namespace json {
22   
namespace json {
23   
namespace detail {
23   
namespace detail {
24  
24  
25   
struct key_t
25   
struct key_t
26   
{
26   
{
27   
};
27   
};
28  
28  
29   
#if 0
29   
#if 0
30   
template<class T>
30   
template<class T>
31   
struct to_number_limit
31   
struct to_number_limit
32   
    : std::numeric_limits<T>
32   
    : std::numeric_limits<T>
33   
{
33   
{
34   
};
34   
};
35  
35  
36   
template<class T>
36   
template<class T>
37   
struct to_number_limit<T const>
37   
struct to_number_limit<T const>
38   
    : to_number_limit<T>
38   
    : to_number_limit<T>
39   
{
39   
{
40   
};
40   
};
41  
41  
42   
template<>
42   
template<>
43   
struct to_number_limit<long long>
43   
struct to_number_limit<long long>
44   
{
44   
{
45   
    static constexpr long long (min)() noexcept
45   
    static constexpr long long (min)() noexcept
46   
    {
46   
    {
47   
        return -9223372036854774784;
47   
        return -9223372036854774784;
48   
    }
48   
    }
49  
49  
50   
    static constexpr long long (max)() noexcept
50   
    static constexpr long long (max)() noexcept
51   
    {
51   
    {
52   
        return 9223372036854774784;
52   
        return 9223372036854774784;
53   
    }
53   
    }
54   
};
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};
55  
55  
56   
template<>
56   
template<>
57   
struct to_number_limit<unsigned long long>
57   
struct to_number_limit<unsigned long long>
58   
{
58   
{
59   
    static constexpr
59   
    static constexpr
60   
    unsigned long long (min)() noexcept
60   
    unsigned long long (min)() noexcept
61   
    {
61   
    {
62   
        return 0;
62   
        return 0;
63   
    }
63   
    }
64  
64  
65   
    static constexpr
65   
    static constexpr
66   
    unsigned long long (max)() noexcept
66   
    unsigned long long (max)() noexcept
67   
    {
67   
    {
68   
        return 18446744073709549568ULL;
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        return 18446744073709549568ULL;
69   
    }
69   
    }
70   
};
70   
};
71   
#else
71   
#else
72  
72  
73   
template<class T>
73   
template<class T>
74   
class to_number_limit
74   
class to_number_limit
75   
{
75   
{
76   
    // unsigned
76   
    // unsigned
77  
77  
78   
    static constexpr
78   
    static constexpr
79   
    double min1(std::false_type)
79   
    double min1(std::false_type)
80   
    {
80   
    {
81   
        return 0.0;
81   
        return 0.0;
82   
    }
82   
    }
83  
83  
84   
    static constexpr
84   
    static constexpr
85   
    double max1(std::false_type)
85   
    double max1(std::false_type)
86   
    {
86   
    {
87   
        return max2u(std::integral_constant<
87   
        return max2u(std::integral_constant<
88   
            bool, (std::numeric_limits<T>::max)() ==
88   
            bool, (std::numeric_limits<T>::max)() ==
89   
            UINT64_MAX>{});
89   
            UINT64_MAX>{});
90   
    }
90   
    }
91  
91  
92   
    static constexpr
92   
    static constexpr
93   
    double max2u(std::false_type)
93   
    double max2u(std::false_type)
94   
    {
94   
    {
95   
        return static_cast<double>(
95   
        return static_cast<double>(
96   
            (std::numeric_limits<T>::max)());
96   
            (std::numeric_limits<T>::max)());
97   
    }
97   
    }
98  
98  
99   
    static constexpr
99   
    static constexpr
100   
    double max2u(std::true_type)
100   
    double max2u(std::true_type)
101   
    {
101   
    {
102   
        return 18446744073709549568.0;
102   
        return 18446744073709549568.0;
103   
    }
103   
    }
104  
104  
105   
    // signed
105   
    // signed
106  
106  
107   
    static constexpr
107   
    static constexpr
108   
    double min1(std::true_type)
108   
    double min1(std::true_type)
109   
    {
109   
    {
110   
        return min2s(std::integral_constant<
110   
        return min2s(std::integral_constant<
111   
            bool, (std::numeric_limits<T>::max)() ==
111   
            bool, (std::numeric_limits<T>::max)() ==
112   
            INT64_MAX>{});
112   
            INT64_MAX>{});
113   
    }
113   
    }
114  
114  
115   
    static constexpr
115   
    static constexpr
116   
    double min2s(std::false_type)
116   
    double min2s(std::false_type)
117   
    {
117   
    {
118   
        return static_cast<double>(
118   
        return static_cast<double>(
119   
            (std::numeric_limits<T>::min)());
119   
            (std::numeric_limits<T>::min)());
120   
    }
120   
    }
121  
121  
122   
    static constexpr
122   
    static constexpr
123   
    double min2s(std::true_type)
123   
    double min2s(std::true_type)
124   
    {
124   
    {
125   
        return -9223372036854774784.0;
125   
        return -9223372036854774784.0;
126   
    }
126   
    }
127  
127  
128   
    static constexpr
128   
    static constexpr
129   
    double max1(std::true_type)
129   
    double max1(std::true_type)
130   
    {
130   
    {
131   
        return max2s(std::integral_constant<
131   
        return max2s(std::integral_constant<
132   
            bool, (std::numeric_limits<T>::max)() ==
132   
            bool, (std::numeric_limits<T>::max)() ==
133   
            INT64_MAX>{});
133   
            INT64_MAX>{});
134   
    }
134   
    }
135  
135  
136   
    static constexpr
136   
    static constexpr
137   
    double max2s(std::false_type)
137   
    double max2s(std::false_type)
138   
    {
138   
    {
139   
        return static_cast<double>(
139   
        return static_cast<double>(
140   
            (std::numeric_limits<T>::max)());
140   
            (std::numeric_limits<T>::max)());
141   
    }
141   
    }
142  
142  
143   
    static constexpr
143   
    static constexpr
144   
    double max2s(std::true_type)
144   
    double max2s(std::true_type)
145   
    {
145   
    {
146   
        return 9223372036854774784.0;
146   
        return 9223372036854774784.0;
147   
    }
147   
    }
148  
148  
149   
public:
149   
public:
150   
    static constexpr
150   
    static constexpr
151   
    double (min)() noexcept
151   
    double (min)() noexcept
152   
    {
152   
    {
153   
        return min1(std::is_signed<T>{});
153   
        return min1(std::is_signed<T>{});
154   
    }
154   
    }
155  
155  
156   
    static constexpr
156   
    static constexpr
157   
    double (max)() noexcept
157   
    double (max)() noexcept
158   
    {
158   
    {
159   
        return max1(std::is_signed<T>{});
159   
        return max1(std::is_signed<T>{});
160   
    }
160   
    }
161   
};
161   
};
162  
162  
163   
#endif
163   
#endif
164  
164  
165   
struct scalar
165   
struct scalar
166   
{
166   
{
167   
    storage_ptr sp; // must come first
167   
    storage_ptr sp; // must come first
168   
    kind k;         // must come second
168   
    kind k;         // must come second
169   
    union
169   
    union
170   
    {
170   
    {
171   
        bool b;
171   
        bool b;
172   
        std::int64_t i;
172   
        std::int64_t i;
173   
        std::uint64_t u;
173   
        std::uint64_t u;
174   
        double d;
174   
        double d;
175   
    };
175   
    };
176  
176  
177   
    explicit
177   
    explicit
178   
    scalar(storage_ptr sp_ = {}) noexcept
178   
    scalar(storage_ptr sp_ = {}) noexcept
179   
        : sp(std::move(sp_))
179   
        : sp(std::move(sp_))
180   
        , k(json::kind::null)
180   
        , k(json::kind::null)
181   
    {
181   
    {
182   
    }
182   
    }
183  
183  
184   
    explicit
184   
    explicit
185   
    scalar(bool b_,
185   
    scalar(bool b_,
186   
        storage_ptr sp_ = {}) noexcept
186   
        storage_ptr sp_ = {}) noexcept
187   
        : sp(std::move(sp_))
187   
        : sp(std::move(sp_))
188   
        , k(json::kind::bool_)
188   
        , k(json::kind::bool_)
189   
        , b(b_)
189   
        , b(b_)
190   
    {
190   
    {
191   
    }
191   
    }
192  
192  
193   
    explicit
193   
    explicit
194   
    scalar(std::int64_t i_,
194   
    scalar(std::int64_t i_,
195   
        storage_ptr sp_ = {}) noexcept
195   
        storage_ptr sp_ = {}) noexcept
196   
        : sp(std::move(sp_))
196   
        : sp(std::move(sp_))
197   
        , k(json::kind::int64)
197   
        , k(json::kind::int64)
198   
        , i(i_)
198   
        , i(i_)
199   
    {
199   
    {
200   
    }
200   
    }
201  
201  
202   
    explicit
202   
    explicit
203   
    scalar(std::uint64_t u_,
203   
    scalar(std::uint64_t u_,
204   
        storage_ptr sp_ = {}) noexcept
204   
        storage_ptr sp_ = {}) noexcept
205   
        : sp(std::move(sp_))
205   
        : sp(std::move(sp_))
206   
        , k(json::kind::uint64)
206   
        , k(json::kind::uint64)
207   
        , u(u_)
207   
        , u(u_)
208   
    {
208   
    {
209   
    }
209   
    }
210  
210  
211   
    explicit
211   
    explicit
212   
    scalar(double d_,
212   
    scalar(double d_,
213   
        storage_ptr sp_ = {}) noexcept
213   
        storage_ptr sp_ = {}) noexcept
214   
        : sp(std::move(sp_))
214   
        : sp(std::move(sp_))
215   
        , k(json::kind::double_)
215   
        , k(json::kind::double_)
216   
        , d(d_)
216   
        , d(d_)
217   
    {
217   
    {
218   
    }
218   
    }
219   
};
219   
};
220  
220  
221   
struct access
221   
struct access
222   
{
222   
{
223   
    template<class Value, class... Args>
223   
    template<class Value, class... Args>
224   
    static
224   
    static
225   
    Value&
225   
    Value&
226   
    construct_value(Value* p, Args&&... args)
226   
    construct_value(Value* p, Args&&... args)
227   
    {
227   
    {
228   
        return *reinterpret_cast<
228   
        return *reinterpret_cast<
229   
            Value*>(::new(p) Value(
229   
            Value*>(::new(p) Value(
230   
            std::forward<Args>(args)...));
230   
            std::forward<Args>(args)...));
231   
    }
231   
    }
232  
232  
233   
    template<class KeyValuePair, class... Args>
233   
    template<class KeyValuePair, class... Args>
234   
    static
234   
    static
235   
    KeyValuePair&
235   
    KeyValuePair&
236   
    construct_key_value_pair(
236   
    construct_key_value_pair(
237   
        KeyValuePair* p, Args&&... args)
237   
        KeyValuePair* p, Args&&... args)
238   
    {
238   
    {
239   
        return *reinterpret_cast<
239   
        return *reinterpret_cast<
240   
            KeyValuePair*>(::new(p)
240   
            KeyValuePair*>(::new(p)
241   
                KeyValuePair(
241   
                KeyValuePair(
242   
                    std::forward<Args>(args)...));
242   
                    std::forward<Args>(args)...));
243   
    }
243   
    }
244  
244  
245   
    template<class Value>
245   
    template<class Value>
246   
    static
246   
    static
247   
    char const*
247   
    char const*
248   
    release_key(
248   
    release_key(
249   
        Value& jv,
249   
        Value& jv,
250   
        std::size_t& len) noexcept
250   
        std::size_t& len) noexcept
251   
    {
251   
    {
252   
        BOOST_ASSERT(jv.is_string());
252   
        BOOST_ASSERT(jv.is_string());
253   
        jv.str_.sp_.~storage_ptr();
253   
        jv.str_.sp_.~storage_ptr();
254   
        return jv.str_.impl_.release_key(len);
254   
        return jv.str_.impl_.release_key(len);
255   
    }
255   
    }
256  
256  
257   
    using index_t = std::uint32_t;
257   
    using index_t = std::uint32_t;
258  
258  
259   
    template<class KeyValuePair>
259   
    template<class KeyValuePair>
260   
    static
260   
    static
261   
    index_t&
261   
    index_t&
262   
    next(KeyValuePair& e) noexcept
262   
    next(KeyValuePair& e) noexcept
263   
    {
263   
    {
264   
        return e.next_;
264   
        return e.next_;
265   
    }
265   
    }
266  
266  
267   
    template<class KeyValuePair>
267   
    template<class KeyValuePair>
268   
    static
268   
    static
269   
    index_t const&
269   
    index_t const&
270   
    next(KeyValuePair const& e) noexcept
270   
    next(KeyValuePair const& e) noexcept
271   
    {
271   
    {
272   
        return e.next_;
272   
        return e.next_;
273   
    }
273   
    }
274   
};
274   
};
275  
275  
276   
BOOST_JSON_DECL
276   
BOOST_JSON_DECL
277   
std::size_t
277   
std::size_t
278   
hash_value_impl( value const& jv ) noexcept;
278   
hash_value_impl( value const& jv ) noexcept;
279  
279  
280   
} // detail
280   
} // detail
281   
} // namespace json
281   
} // namespace json
282   
} // namespace boost
282   
} // namespace boost
283  
283  
284   
#endif
284   
#endif