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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
#include "./binary.hpp"
#include "./decimal.hpp"
#include "./error.hpp"
#include "./internal/comparable.hpp"
#include "./internal/export.hpp"
#include "./internal/type_traits.hpp"
#include "./symbol.hpp"
#include "./timestamp.hpp"
#include "./type_id.hpp"
#include "./types_fwd.hpp"
#include "./uuid.hpp"
#include <proton/type_compat.h>
#include <iosfwd>
#include <string>
#include <typeinfo>
/// @file
/// @copybrief proton::scalar_base
namespace proton {
class scalar_base;
namespace codec {
class decoder;
class encoder;
namespace internal {
template<class T> T get(const scalar_base& s);
/// The base class for scalar types.
class scalar_base : private internal::comparable<scalar_base> {
/// AMQP type of data stored in the scalar
PN_CPP_EXTERN type_id type() const;
/// True if there is no value, i.e. type() == NULL_TYPE.
PN_CPP_EXTERN bool empty() const;
/// Compare
friend PN_CPP_EXTERN bool operator<(const scalar_base& x, const scalar_base& y);
/// Compare
friend PN_CPP_EXTERN bool operator==(const scalar_base& x, const scalar_base& y);
/// Print the contained value
friend PN_CPP_EXTERN std::ostream& operator<<(std::ostream& o, const scalar_base& x);
PN_CPP_EXTERN scalar_base(const pn_atom_t& a);
PN_CPP_EXTERN scalar_base();
PN_CPP_EXTERN scalar_base(const scalar_base&);
PN_CPP_EXTERN scalar_base& operator=(const scalar_base&);
PN_CPP_EXTERN void put_(bool);
PN_CPP_EXTERN void put_(uint8_t);
PN_CPP_EXTERN void put_(int8_t);
PN_CPP_EXTERN void put_(uint16_t);
PN_CPP_EXTERN void put_(int16_t);
PN_CPP_EXTERN void put_(uint32_t);
PN_CPP_EXTERN void put_(int32_t);
PN_CPP_EXTERN void put_(uint64_t);
PN_CPP_EXTERN void put_(int64_t);
PN_CPP_EXTERN void put_(wchar_t);
PN_CPP_EXTERN void put_(float);
PN_CPP_EXTERN void put_(double);
PN_CPP_EXTERN void put_(timestamp);
PN_CPP_EXTERN void put_(const decimal32&);
PN_CPP_EXTERN void put_(const decimal64&);
PN_CPP_EXTERN void put_(const decimal128&);
PN_CPP_EXTERN void put_(const uuid&);
PN_CPP_EXTERN void put_(const std::string&);
PN_CPP_EXTERN void put_(const symbol&);
PN_CPP_EXTERN void put_(const binary&);
PN_CPP_EXTERN void put_(const char* s); ///< Treated as an AMQP string
PN_CPP_EXTERN void put_(const null&);
PN_CPP_EXTERN void put_(decltype(nullptr));
template<class T> void put(const T& x) { putter<T>::put(*this, x); }
PN_CPP_EXTERN void get_(bool&) const;
PN_CPP_EXTERN void get_(uint8_t&) const;
PN_CPP_EXTERN void get_(int8_t&) const;
PN_CPP_EXTERN void get_(uint16_t&) const;
PN_CPP_EXTERN void get_(int16_t&) const;
PN_CPP_EXTERN void get_(uint32_t&) const;
PN_CPP_EXTERN void get_(int32_t&) const;
PN_CPP_EXTERN void get_(uint64_t&) const;
PN_CPP_EXTERN void get_(int64_t&) const;
PN_CPP_EXTERN void get_(wchar_t&) const;
PN_CPP_EXTERN void get_(float&) const;
PN_CPP_EXTERN void get_(double&) const;
PN_CPP_EXTERN void get_(timestamp&) const;
PN_CPP_EXTERN void get_(decimal32&) const;
PN_CPP_EXTERN void get_(decimal64&) const;
PN_CPP_EXTERN void get_(decimal128&) const;
PN_CPP_EXTERN void get_(uuid&) const;
PN_CPP_EXTERN void get_(std::string&) const;
PN_CPP_EXTERN void get_(symbol&) const;
PN_CPP_EXTERN void get_(binary&) const;
PN_CPP_EXTERN void get_(null&) const;
PN_CPP_EXTERN void get_(decltype(nullptr)&) const;
// use template structs, functions cannot be partially specialized.
template <class T, class Enable=void> struct putter {
static void put(scalar_base& s, const T& x) { s.put_(x); }
template <class T>
struct putter<T, typename internal::enable_if<internal::is_unknown_integer<T>::value>::type> {
static void put(scalar_base& s, const T& x) {
s.put_(static_cast<typename internal::known_integer<T>::type>(x));
template <class T, class Enable=void>
struct getter {
static T get(const scalar_base& s) { T x; s.get_(x); return x; }
template <class T>
struct getter<T, typename internal::enable_if<internal::is_unknown_integer<T>::value>::type> {
static T get(const scalar_base& s) {
typename internal::known_integer<T>::type x; s.get_(x); return x;
void ok(pn_type_t) const;
void set(const pn_atom_t&);
void set(const binary& x, pn_type_t t);
pn_atom_t atom_;
binary bytes_; // Hold binary data.
/// @cond INTERNAL
friend class message;
friend class codec::encoder;
friend class codec::decoder;
template<class T> friend T internal::get(const scalar_base& s);
/// @endcond
namespace internal {
template<class T> T get(const scalar_base& s) {
return scalar_base::getter<T>::get(s);
template <class R, class F> R visit(const scalar_base& s, F f) {
switch(s.type()) {
case BOOLEAN: return f(internal::get<bool>(s));
case UBYTE: return f(internal::get<uint8_t>(s));
case BYTE: return f(internal::get<int8_t>(s));
case USHORT: return f(internal::get<uint16_t>(s));
case SHORT: return f(internal::get<int16_t>(s));
case UINT: return f(internal::get<uint32_t>(s));
case INT: return f(internal::get<int32_t>(s));
case CHAR: return f(internal::get<wchar_t>(s));
case ULONG: return f(internal::get<uint64_t>(s));
case LONG: return f(internal::get<int64_t>(s));
case TIMESTAMP: return f(internal::get<timestamp>(s));
case FLOAT: return f(internal::get<float>(s));
case DOUBLE: return f(internal::get<double>(s));
case DECIMAL32: return f(internal::get<decimal32>(s));
case DECIMAL64: return f(internal::get<decimal64>(s));
case DECIMAL128: return f(internal::get<decimal128>(s));
case UUID: return f(internal::get<uuid>(s));
case BINARY: return f(internal::get<binary>(s));
case STRING: return f(internal::get<std::string>(s));
case SYMBOL: return f(internal::get<symbol>(s));
default: throw conversion_error("invalid scalar type "+type_name(s.type()));
PN_CPP_EXTERN conversion_error make_coercion_error(const char* cpp_type, type_id amqp_type);
template<class T> struct coerce_op {
template <class U>
typename enable_if<is_convertible<U, T>::value, T>::type operator()(const U& x) {
return static_cast<T>(x);
template <class U>
typename enable_if<!is_convertible<U, T>::value, T>::type operator()(const U&) {
throw make_coercion_error(typeid(T).name(), type_id_of<U>::value);
template <class T> T coerce(const scalar_base& s) { return visit<T>(s, coerce_op<T>()); }
} // namespace internal
/// Return a readable string representation of x for display purposes.
PN_CPP_EXTERN std::string to_string(const scalar_base& x);
} // proton