size_util.hpp

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// Copyright Takatoshi Kondo 2020
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
 
#if !defined(MQTT_SIZE_UTIL_HPP)
#define MQTT_SIZE_UTIL_HPP
 
#include <mqtt/config.hpp>
 
#include <limits>
#include <utility>
 
#include <boost/assert.hpp>
 
#include <mqtt/namespace.hpp>
#include <mqtt/type.hpp>
 
namespace MQTT_NS {
 
template <typename T>
typename std::enable_if<
    sizeof(typename T::value_type) <= sizeof(variable_integer_t),
    variable_integer_t
>::type
get_size(T const& t) {
    return t.size();
}
 
template <typename T>
typename std::enable_if<
    ! (sizeof(typename T::value_type) <= sizeof(variable_integer_t)),
    variable_integer_t
>::type
get_size(T const& t) {
    BOOST_ASSERT(t.size() <= std::numeric_limits<variable_integer_t>::max());
    return t.size(t.size());
}
 
} // namespace MQTT_NS
 
#endif // MQTT_SIZE_UTIL_HPP