1 #ifndef PROTON_VALUE_HPP 2 #define PROTON_VALUE_HPP 25 #include "./codec/encoder.hpp" 26 #include "./codec/decoder.hpp" 27 #include "./internal/type_traits.hpp" 28 #include "./scalar.hpp" 31 #include <proton/type_compat.h> 42 internal::data& data();
45 friend class value_ref;
46 friend class codec::encoder;
47 friend class codec::decoder;
55 class value :
public internal::value_base,
private internal::comparable<value> {
58 template<
class T,
class U=
void>
struct assignable :
59 public internal::enable_if<codec::is_encodable<T>::value, U> {};
60 template<
class U>
struct assignable<value, U> {};
64 PN_CPP_EXTERN value();
68 PN_CPP_EXTERN value(
const value&);
69 PN_CPP_EXTERN value& operator=(
const value&);
70 #if PN_CPP_HAS_RVALUE_REFERENCES 71 PN_CPP_EXTERN value(value&&);
72 PN_CPP_EXTERN value& operator=(value&&);
77 template <
class T>
value(
const T& x,
typename assignable<T>::type* = 0) { *
this = x; }
80 template <
class T>
typename assignable<T, value&>::type
operator=(
const T& x) {
87 PN_CPP_EXTERN
type_id type()
const;
90 PN_CPP_EXTERN
bool empty()
const;
94 PN_CPP_EXTERN
void clear();
97 template<
class T>
void get(T &t)
const;
98 template<
class T> T
get()
const;
99 PN_CPP_EXTERN int64_t as_int()
const;
100 PN_CPP_EXTERN uint64_t as_uint()
const;
101 PN_CPP_EXTERN
double as_double()
const;
102 PN_CPP_EXTERN std::string as_string()
const;
106 friend PN_CPP_EXTERN
void swap(value&, value&);
110 friend PN_CPP_EXTERN
bool operator==(
const value& x,
const value& y);
111 friend PN_CPP_EXTERN
bool operator<(
const value& x,
const value& y);
118 friend PN_CPP_EXTERN std::ostream&
operator<<(std::ostream&,
const value&);
130 class value_ref :
public value {
132 value_ref(pn_data_t* = 0);
133 value_ref(
const internal::data&);
134 value_ref(
const value_base&);
137 void refer(pn_data_t*);
138 void refer(
const internal::data&);
139 void refer(
const value_base&);
145 template <
class T> value_ref& operator=(
const T& x) {
146 static_cast<value&
>(*this) = x;
156 template<
class T> T
get(
const value& v) { T x;
get(v, x);
return x; }
166 template<
class T,
class U>
inline void get(
const U& u, T& x) {
const value v(u);
get(v, x); }
179 if (type_id_is_scalar(v.
type())) {
182 x = internal::coerce<T>(s);
197 template<
class T>
void value::get(T &x)
const { x = proton::get<T>(*this); }
198 template<
class T> T
value::get()
const {
return proton::get<T>(*this); }
199 inline int64_t value::as_int()
const {
return proton::coerce<int64_t>(*this); }
200 inline uint64_t value::as_uint()
const {
return proton::coerce<uint64_t>(*this); }
201 inline double value::as_double()
const {
return proton::coerce<double>(*this); }
202 inline std::string value::as_string()
const {
return proton::coerce<std::string>(*this); }
207 #endif // PROTON_VALUE_HPP A holder for an instance of any scalar AMQP type.
Definition: scalar.hpp:32
std::ostream & operator<<(std::ostream &, const binary &)
Print a binary value.
T get(const value &v)
Get a contained value of type T.
Definition: value.hpp:156
The null type, contains no data.
Definition: type_id.hpp:39
void get< null >(const value &v, null &)
Special case for get<null>(), just checks that value contains NULL.
Definition: value.hpp:189
Experimental - Stream-like encoder from C++ values to AMQP bytes.
Definition: encoder.hpp:47
assignable< T, value & >::type operator=(const T &x)
Assign from any allowed type T.
Definition: value.hpp:80
value(const T &x, typename assignable< T >::type *=0)
Construct from any allowed type T.
Definition: value.hpp:77
void coerce(const value &v, T &x)
Like coerce(const value&) but assigns the value to a reference instead of returning it...
Definition: value.hpp:177
std::string to_string(const scalar_base &x)
Return a readable string representation of x for display purposes.
type_id
An identifier for AMQP types.
Definition: type_id.hpp:38
T coerce(const value &v)
Coerce the contained value to type T.
Definition: value.hpp:170
Forward declarations for all the C++ types used by Proton to represent AMQP types.
A holder for any AMQP value, simple or complex.
Definition: value.hpp:55
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...
The main Proton namespace.
Definition: annotation_key.hpp:30
type_id type() const
Get the type ID for the current value.
Experimental - Stream-like decoder from AMQP bytes to C++ values.
Definition: decoder.hpp:53