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148 lines
5.0 KiB
148 lines
5.0 KiB
// Copyright (c) 2016-2020, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#pragma once
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// the loose definitions of types in this file are, well, loose.
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//
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// these helpers aren't here for absolute type certainty at compile-time,
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// but rather to help with templated functions telling types apart.
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namespace sfinae
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{
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typedef char true_type;
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struct false_type { true_type a[2]; };
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template <typename T>
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struct is_not_container
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{
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private:
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// does not have const iterator
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template <typename C> static false_type c_iter(typename C::const_iterator*);
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template <typename C> static true_type c_iter(...);
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// does not have value_type
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template <typename C> static false_type v_type(typename C::value_type*);
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template <typename C> static true_type v_type(...);
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// does not have key_type
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template <typename C> static false_type k_type(typename C::key_type*);
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template <typename C> static true_type k_type(...);
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// does not have mapped_type
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template <typename C> static false_type m_type(typename C::mapped_type*);
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template <typename C> static true_type m_type(...);
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public:
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static const bool value = (
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(
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sizeof(c_iter<T>(0)) == sizeof(true_type) &&
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sizeof(v_type<T>(0)) == sizeof(true_type) &&
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sizeof(k_type<T>(0)) == sizeof(true_type) &&
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sizeof(m_type<T>(0)) == sizeof(true_type)
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)
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|| std::is_same<T, std::string>::value
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);
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typedef T type;
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};
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template <typename T>
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struct is_vector_like
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{
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private:
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// has const iterator
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template <typename C> static true_type c_iter(typename C::const_iterator*);
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template <typename C> static false_type c_iter(...);
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// has value_type
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template <typename C> static true_type v_type(typename C::value_type*);
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template <typename C> static false_type v_type(...);
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// does not have key_type
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template <typename C> static false_type k_type(typename C::key_type*);
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template <typename C> static true_type k_type(...);
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// does not have mapped_type
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template <typename C> static false_type m_type(typename C::mapped_type*);
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template <typename C> static true_type m_type(...);
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public:
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static const bool value = (
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sizeof(c_iter<T>(0)) == sizeof(true_type) &&
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sizeof(v_type<T>(0)) == sizeof(true_type) &&
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sizeof(k_type<T>(0)) == sizeof(true_type) &&
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sizeof(m_type<T>(0)) == sizeof(true_type) &&
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!std::is_same<T, std::string>::value
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);
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typedef T type;
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};
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template <typename T>
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struct is_map_like
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{
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private:
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// has const iterator
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template <typename C> static true_type c_iter(typename C::const_iterator*);
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template <typename C> static false_type c_iter(...);
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// has value_type
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template <typename C> static true_type v_type(typename C::value_type*);
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template <typename C> static false_type v_type(...);
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// has key_type
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template <typename C> static true_type k_type(typename C::key_type*);
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template <typename C> static false_type k_type(...);
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// has mapped_type
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template <typename C> static true_type m_type(typename C::mapped_type*);
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template <typename C> static false_type m_type(...);
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public:
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static const bool value = (
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sizeof(c_iter<T>(0)) == sizeof(true_type) &&
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sizeof(v_type<T>(0)) == sizeof(true_type) &&
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sizeof(k_type<T>(0)) == sizeof(true_type) &&
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sizeof(m_type<T>(0)) == sizeof(true_type) &&
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!std::is_same<T, std::string>::value
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);
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typedef T type;
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};
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} // namespace sfinae
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