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#ifndef PROTON_SCALAR_HPP
#define PROTON_SCALAR_HPP
/*
* 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
#include "./scalar_base.hpp"
#include "proton/null.hpp"
#include <proton/type_compat.h>
/// @file
/// @copybrief proton::scalar
namespace proton {
/// A holder for an instance of any scalar AMQP type.
///
/// @see @ref types_page
class scalar : public scalar_base {
public:
/// Create an empty scalar.
PN_CPP_EXTERN scalar() = default;
/// Construct from any scalar type.
template <class T> scalar(const T& x) { *this = x; }
/// Assign from any scalar type.
template <class T> scalar& operator=(const T& x) { put(x); return *this; }
/// Clear the scalar, making it empty().
void clear() { *this = null(); }
};
/// Get a contained value of type T. For example:
///
/// uint64_t i = get<uint64_t>(x)
///
/// This will succeed if and only if x contains a uint64_t value.
///
/// @throw conversion_error if contained value is not of type T.
/// @relatedalso scalar
template<class T> T get(const scalar& s) { return internal::get<T>(s); }
/// Coerce the contained value to type T. For example:
///
/// uint64_t i = coerce<uint64_t>(x)
///
/// This will succeed if x contains any numeric value, but may lose
/// precision if it contains a float or double value.
///
/// @throw conversion_error if the value cannot be converted to T
/// according to `std::is_convertible`
/// @relatedalso scalar
template<class T> T coerce(const scalar& x) { return internal::coerce<T>(x); }
/// Coerce the contained value to type T. For example:
///
/// uint64_t i = coerce<uint64_t>(x)
///
/// This will succeed if x contains any numeric value, but may lose
/// precision if it contains a float or double value.
///
/// @throw conversion_error if the value cannot be converted to T
/// according to `std::is_convertible`
/// @relatedalso scalar
template<class T> T coerce(scalar& x) { return internal::coerce<T>(x); }
} // proton
#endif // PROTON_SCALAR_HPP
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