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/*
* Copyright (c) 2014, Ford Motor Company
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following
* disclaimer in the documentation and/or other materials provided with the
* distribution.
*
* Neither the name of the Ford Motor Company nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SRC_COMPONENTS_UTILS_INCLUDE_UTILS_HELPERS_H
#define SRC_COMPONENTS_UTILS_INCLUDE_UTILS_HELPERS_H
/**
* These helpers allows to simplify compare strategy between some objects.
* Suppose user has some enum with value E with some numbers of possible values
* enum E {V1, V2, V3, V5};
* So we want to know if some user-input value is belong to one of the enum's subset.
* Usually user has to do next routine
*
* E input_value = V3;
* if (input_value == V1 || input_value == V2 || input_value == V3) {
* do_some_stuff_here;
* }
*
* How it suppose to be with these helpers methods:
*
* E input_value = V3;
* if (Compare<E, EQ, ONE>(input_value, V1, V2, V3)) {
* do_some_stuff;
* }
*
* Also User is able to easily change compare startegy by using some set of
* predefined startegies.
*/
namespace helpers {
template<typename T>
bool EQ (T what, T to) {
return what == to;
}
template<typename T>
bool NEQ (T what, T to) {
return !EQ<T>(what, to);
}
template<class U = bool>
bool ALL (U what, U to) {
return what && to;
}
template<class U = bool>
bool ONE (U what, U to) {
return what || to;
}
template <typename T,
bool (*CompareType)(T ,T),
bool (*CmpStrategy)(bool ,bool)>
bool Compare (T what, T to) {
return CompareType(what, to);
}
template <typename T,
bool (*CompareType)(T ,T),
bool (*CmpStrategy)(bool, bool)>
bool Compare(T what, T to, T to1) {
return CmpStrategy(Compare<T, CompareType, CmpStrategy>(what, to),
Compare<T, CompareType, CmpStrategy>(what, to1));
}
template <typename T,
bool (*CompareType)(T ,T),
bool (*CmpStrategy)(bool, bool)>
bool Compare(T what, T to, T to1, T to2) {
return CmpStrategy(Compare<T, CompareType, CmpStrategy>(what, to, to1),
Compare<T, CompareType, CmpStrategy>(what, to2));
}
template <typename T,
bool (*CompareType)(T ,T),
bool (*CmpStrategy)(bool, bool)>
bool Compare(T what, T to, T to1, T to2, T to3) {
return CmpStrategy(Compare<T, CompareType, CmpStrategy>(what, to, to1, to2),
Compare<T, CompareType, CmpStrategy>(what, to3));
}
template <typename T,
bool (*CompareType)(T ,T),
bool (*CmpStrategy)(bool, bool)>
bool Compare(T what, T to, T to1, T to2, T to3, T to4) {
return CmpStrategy(Compare<T, CompareType, CmpStrategy>(what, to, to1, to2, to3),
Compare<T, CompareType, CmpStrategy>(what, to4));
}
}
#endif // SRC_COMPONENTS_UTILS_INCLUDE_UTILS_HELPERS_H
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