mirror of
https://github.com/matrix-construct/construct
synced 2024-10-31 10:58:54 +01:00
127 lines
2.6 KiB
C++
127 lines
2.6 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_CMP_H
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// Simple case insensitive comparison convenience utils
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namespace ircd
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{
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struct iless;
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struct igreater;
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struct iequals;
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}
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/// Case insensitive string comparison deciding if two strings are equal
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struct ircd::iequals
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{
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using is_transparent = std::true_type;
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bool s;
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operator const bool &() const
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{
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return s;
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}
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bool operator()(const string_view &a, const string_view &b) const;
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template<class A,
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class B>
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iequals(A&& a, B&& b)
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:s{operator()(std::forward<A>(a), std::forward<B>(b))}
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{}
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iequals() = default;
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};
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inline bool
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ircd::iequals::operator()(const string_view &a,
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const string_view &b)
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const
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{
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return std::equal(begin(a), end(a), begin(b), end(b), []
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(const char &a, const char &b)
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{
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return tolower(a) == tolower(b);
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});
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}
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/// Case insensitive string comparison deciding which string compares 'less'
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/// than the other.
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struct ircd::iless
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{
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using is_transparent = std::true_type;
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bool s;
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operator const bool &() const
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{
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return s;
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}
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bool operator()(const string_view &a, const string_view &b) const;
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template<class A,
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class B>
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iless(A&& a, B&& b)
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:s{operator()(std::forward<A>(a), std::forward<B>(b))}
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{}
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iless() = default;
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};
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inline bool
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ircd::iless::operator()(const string_view &a,
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const string_view &b)
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const
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{
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return std::lexicographical_compare(begin(a), end(a), begin(b), end(b), []
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(const char &a, const char &b)
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{
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return tolower(a) < tolower(b);
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});
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}
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/// Case insensitive string comparison deciding which string compares 'greater'
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/// than the other.
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struct ircd::igreater
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{
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using is_transparent = std::true_type;
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bool s;
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operator const bool &() const
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{
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return s;
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}
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bool operator()(const string_view &a, const string_view &b) const;
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template<class A,
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class B>
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igreater(A&& a, B&& b)
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:s{operator()(std::forward<A>(a), std::forward<B>(b))}
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{}
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igreater() = default;
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};
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inline bool
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ircd::igreater::operator()(const string_view &a,
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const string_view &b)
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const
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{
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return std::lexicographical_compare(begin(a), end(a), begin(b), end(b), []
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(const char &a, const char &b)
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{
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return tolower(a) > tolower(b);
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});
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}
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