Qpid Proton C++ API
0.33.0
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Go to the documentation of this file. 1 #ifndef PROTON_VALUE_HPP
2 #define PROTON_VALUE_HPP
27 #include "./internal/type_traits.hpp"
31 #include <proton/type_compat.h>
45 internal::data& data();
48 friend class codec::encoder;
49 friend class codec::decoder;
57 class value :
public internal::value_base,
private internal::comparable<value> {
60 template<
class T,
class U=
void>
struct assignable :
61 public internal::enable_if<codec::is_encodable<T>::value, U> {};
62 template<
class U>
struct assignable<
value, U> {};
72 #if PN_CPP_HAS_RVALUE_REFERENCES
79 template <
class T>
value(
const T& x,
typename assignable<T>::type* = 0) { *
this = x; }
82 template <
class T>
typename assignable<T, value&>::type
operator=(
const T& x) {
92 PN_CPP_EXTERN
bool empty()
const;
98 template<
class T> PN_CPP_DEPRECATED(
"Use 'proton::get'") void
get(T &t) const;
99 template<class T> PN_CPP_DEPRECATED("Use '
proton::
get'") T
get() const;
107 friend PN_CPP_EXTERN
bool operator==(const
value& x, const
value& y);
108 friend PN_CPP_EXTERN
bool operator<(const
value& x, const
value& y);
115 friend PN_CPP_EXTERN std::ostream& operator<<(std::ostream&, const
value&);
120 void reset(pn_data_t* d = 0);
126 template<class T> T
get(const
value& v) { T x;
get(v, x);
return x; }
136 template<
class T,
class U>
inline void get(
const U& u, T& x) {
const value v(u);
get(v, x); }
150 if (type_id_is_scalar(v.
type())) {
152 x = internal::coerce<T>(s);
162 #if PN_CPP_HAS_NULLPTR
173 template<
class T>
void value::get(T &x)
const { x = proton::get<T>(*
this); }
174 template<
class T> T
value::get()
const {
return proton::get<T>(*
this); }
179 #endif // PROTON_VALUE_HPP
A holder for an instance of any scalar AMQP type.
Definition: scalar.hpp:37
type_id type() const
Get the type ID for the current value.
value()
Create a null value.
void get< null >(const value &v, null &)
Special case for null, just checks that value contains NULL.
Definition: value.hpp:159
A holder for an instance of any scalar AMQP type.
bool empty() const
True if the value is null.
A holder for any AMQP value, simple or complex.
Definition: value.hpp:57
void clear()
Reset the value to null/empty.
@ NULL_TYPE
The null type, contains no data.
Definition: type_id.hpp:38
std::string to_string(const message &)
Human readable string representation.
T get(const value &v)
Get a contained value of type T.
Definition: value.hpp:126
type_id
An identifier for AMQP types.
Definition: type_id.hpp:37
Unsettled API - A stream-like decoder from AMQP bytes to C++ values.
Definition: decoder.hpp:56
Unsettled API - A stream-like decoder from AMQP bytes to C++ values.
T coerce(const value &v)
Coerce the contained value to type T.
Definition: value.hpp:140
void get< decltype(nullptr)>(const value &v, decltype(nullptr)&)
Special case for null, just checks that value contains NULL.
Definition: value.hpp:164
assignable< T, value & >::type operator=(const T &x)
Assign from any allowed type T.
Definition: value.hpp:82
value(const T &x, typename assignable< T >::type *=0)
Copy from any allowed type T.
Definition: value.hpp:79
Unsettled API - A stream-like encoder from C++ values to AMQP bytes.
Definition: encoder.hpp:50
The main Proton namespace.
Definition: annotation_key.hpp:33
Unsettled API - A stream-like encoder from C++ values to AMQP bytes.
friend void swap(value &, value &)
swap values
void assert_type_equal(type_id want, type_id got)
Throw a conversion_error if want != got with a message including the names of the types.
Forward declarations for Proton types used to represent AMQP types.