OnixS C++ B3 BOE Binary Order Entry  1.2.0
API Documentation
MaxMessageSize.h
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20 
21 #pragma once
22 
23 #include <OnixS/B3/BOE/ABI.h>
24 #include <OnixS/B3/BOE/Compiler.h>
25 
29 
31 
33 
34 /// Maximum supported message size.
36 
37 #if defined(ONIXS_B3_BOE_CXX11)
38 
39 /// \private
40 template <typename Message>
41 struct MaxMessageSizeTraits
42 {
43  static constexpr bool UseCustomValue = false;
44 };
45 
46 /// Calculates the buffer size for a message with the given number of repeating group items.
47 template<typename Message>
48 constexpr
50 {
51  return
52  ONIXS_B3_BOE_ASSERT(Message::getMaxMessageSize(maxGroupItems) <= MaxB3BOEMessageSize),
53  static_cast<MessageSize>(Message::getMaxMessageSize(maxGroupItems));
54 }
55 
56 /// Calculates the buffer size for a message with the given number of repeating group items.
57 template<typename Message>
58 constexpr
59 typename std::enable_if<MaxMessageSizeTraits<Message>::UseCustomValue, MessageSize>::type
61 {
62  return
64 }
65 
66 /// Calculates the buffer size for a message with the given number of repeating group items.
67 template<typename Message>
68 constexpr
69 typename std::enable_if<!MaxMessageSizeTraits<Message>::UseCustomValue, MessageSize>::type
70 getMaxMessageSize(UInt8 maxGroupItems)
71 {
72  return calculateMaxMessageSize<Message>(maxGroupItems);
73 }
74 
75 /// \private
76 template<typename Message, UInt8 MaxGroupItems>
77 struct GetMaxMessageSize
78 {
79  enum {Size = getMaxMessageSize<Message>(MaxGroupItems)};
80 };
81 
82 /// \private
83 template<typename Message>
84 constexpr
85 UInt16 getMinMessageSize()
86 {
87  return
88  Message::blockLength(Message::Schema::Version)
89  + MessageHeader::Size
90  + Message::getMinimalVariableFieldsSize(Message::Schema::Version);
91 }
92 
93 /// \private
94 template<typename Message>
95 struct GetMinMessageSize
96 {
97  enum {Size = getMinMessageSize<Message>()};
98 };
99 
100 #else
101 
102 /// \private
103 template<typename Message, UInt8>
104 struct GetMaxMessageSize
105 {
106  enum {Size = MaxB3BOEMessageSize};
107 };
108 
109 /// \private
110 template<typename Message>
111 struct GetMinMessageSize
112 {
113  enum {Size = sizeof(SimpleOpenFramingHeader) + sizeof(MessageHeader) + 1};
114 };
115 
116 #endif
117 
#define ONIXS_B3_BOE_MESSAGING_NAMESPACE_END
Definition: ABI.h:144
constexpr std::enable_if<!MaxMessageSizeTraits< Message >::UseCustomValue, MessageSize >::type getMaxMessageSize(UInt8 maxGroupItems)
Calculates the buffer size for a message with the given number of repeating group items...
UInt16 MessageSize
Message length type.
Definition: Aliases.h:29
constexpr UInt16 MaxB3BOEMessageSize
Maximum supported message size.
#define ONIXS_B3_BOE_MESSAGING_NAMESPACE_BEGIN
Definition: ABI.h:140
Message identifiers and length of message root.
Definition: Composites.h:33
constexpr MessageSize calculateMaxMessageSize(UInt8 maxGroupItems)
Calculates the buffer size for a message with the given number of repeating group items...
#define ONIXS_B3_BOE_CONST_OR_CONSTEXPR
Definition: Compiler.h:184