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//******************************************************************
//
// Copyright 2014 Intel Mobile Communications GmbH All Rights Reserved.
//
//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
//
// Licensed 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.
//
//-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
#ifndef OC_UTILITIES_H_
#define OC_UTILITIES_H_
#include <map>
#include <vector>
#include <memory>
#include <utility>
#include <exception>
#include <OCException.h>
#include <StringConstants.h>
namespace OC {
namespace Utilities {
typedef std::map<std::string, std::string> QueryParamsKeyVal;
/*
* @brief helper function that parses the query parameters component
* of a URI into a key-value map. This function expects the uri
* parameter to contain the query parameters component of a URI
* (everything after the '?', excluding anything anchors).
*
* Note that output will not perform URL decoding
*/
QueryParamsKeyVal getQueryParams(const std::string& uri);
}
}
/* The C++11 standard unfortunately forgot to provide make_unique<>! However, if we're
using C++14 or later, we want to take the standard library's implementation: */
namespace OC {
#if defined(__cplusplus) && __cplusplus < 201300
template<typename T, typename ...XS>
std::unique_ptr<T> make_unique(XS&& ...xs)
{
return std::unique_ptr<T>(new T(std::forward<XS>(xs)...));
}
#else
using std::make_unique;
#endif
} // namespace OC
namespace OC {
/* Examine an OCStackResult, and either forward its value or raise an exception: */
OCStackResult result_guard(const OCStackResult r);
/* Check for a nullptr, and throw an exception if we see one; otherwise, return the
result of the function call: */
template <typename PtrT, typename FnT, typename ...ParamTs>
auto nil_guard(PtrT&& p, FnT&& fn, ParamTs&& ...params) -> OCStackResult
{
if(nullptr == p)
{
throw OCException(OC::Exception::NIL_GUARD_NULL, OC_STACK_INVALID_PARAM);
}
// Note that the parameters are being passed by reference to std::bind. This is not an
// issue, as it is this function's parameters that are being passed by reference. So,
// unless the parameters are being passed by reference to here (or to checked_guard),
// they won't be modified.
return std::bind(fn, p, std::ref(params)...)();
}
/* Check for nullptr and forward the result of an OC function call on success; raise
an exception on failure or exceptional result: */
template <typename PtrT, typename FnT, typename ...ParamTs>
auto checked_guard(PtrT&& p, FnT&& fn, ParamTs&& ...params) -> OCStackResult
{
return result_guard(nil_guard(p, fn, std::forward<ParamTs>(params)...));
}
} // namespace OC
namespace OC
{
template<typename T, typename = void>
struct is_vector
{
BOOST_STATIC_CONSTEXPR bool value = false;
};
template<typename T>
struct is_vector<T,
typename std::enable_if<
std::is_same<T, std::vector<typename T::value_type, typename T::allocator_type> >::value
>::type
>
{
BOOST_STATIC_CONSTEXPR bool value = true;
};
// type trait to remove the first type from a parameter-packed list
template <typename T>
struct remove_first;
// specialization that does all the work
template<template <typename...> class Base, typename T, typename ...Rest>
struct remove_first< Base<T, Rest...> >
{
typedef Base<Rest...> type;
};
// type trait that will only pass if ToTest is in the parameter pack of T2
template<typename ToTest, typename T2>
struct is_component;
// specialization to handle the single-item case
template<typename ToTest, template <typename...> class Base, typename T>
struct is_component<ToTest, Base<T> >
{
BOOST_STATIC_CONSTEXPR bool value = std::is_same<ToTest, T>::value;
};
// Recursive specialization to handle cases with multiple values
template<typename ToTest, template <typename...> class Base, typename T, typename ...Rest>
struct is_component<ToTest, Base<T, Rest...> >
{
BOOST_STATIC_CONSTEXPR bool value = std::is_same<ToTest, T>::value
|| is_component<ToTest, Base<Rest...> >::value;
};
} // namespace OC
#endif
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