mirror of
https://github.com/matrix-construct/construct
synced 2024-11-27 01:02:46 +01:00
317 lines
7.5 KiB
C++
317 lines
7.5 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) 2016-2018 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_UTIL_TYPOGRAPHY_H
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namespace ircd {
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namespace util {
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//
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// Overloading macros
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//
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/// Macro to arrange a function overload scheme based on the following
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/// convention: An available `name` is chosen, from this name a strong type
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/// is created by appending `_t`. The name itself becomes a static constexpr
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/// instance of this `name_t`. Functions can be declared with an argument
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/// accepting `name_t`, and called by passing `name`
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///
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/// IRCD_OVERLOAD(foo) // declare overload
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/// void function(int, foo_t) {} // overloaded version
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/// void function(int) { function(0, foo); } // calls overloaded version
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/// function(0); // calls regular version
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///
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#define IRCD_OVERLOAD(NAME) \
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static constexpr struct NAME##_t {} NAME {};
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/// Imports an overload scheme from elsewhere without redeclaring the type_t.
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#define IRCD_USING_OVERLOAD(ALIAS, ORIGIN) \
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static constexpr const auto &ALIAS{ORIGIN}
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//
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// Typedef macros
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//
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/// Creates a type `NAME` from original type `TYPE` by inheriting from `TYPE`
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/// and passing through construction to `TYPE`. These implicit conversions
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/// we consider to be a "weak" typedef
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#define IRCD_WEAK_TYPEDEF(TYPE, NAME) \
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struct NAME \
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:TYPE \
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{ \
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using TYPE::TYPE; \
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};
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/// Creates a type `NAME` by wrapping instance of `TYPE` as a member and
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/// providing explicit conversions to `TYPE` and aggregate construction only. We
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/// consider this a "strong" typedef which is useful for wrapping POD types
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/// for overloaded functions, etc.
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#define IRCD_STRONG_TYPEDEF(TYPE, NAME) \
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struct NAME \
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{ \
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TYPE val; \
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\
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explicit operator const TYPE &() const { return val; } \
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explicit operator TYPE &() { return val; } \
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};
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/// Convenience for weak typedef statements
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#define IRCD_WEAK_T(TYPE) \
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IRCD_WEAK_TYPEDEF(TYPE, IRCD_UNIQUE(weak_t))
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/// Convenience for strong typedef statements
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/// ex: using foo_t = IRCD_STRONG_T(int)
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#define IRCD_STRONG_T(TYPE) \
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IRCD_STRONG_TYPEDEF(TYPE, IRCD_UNIQUE(strong_t))
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//
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// Debug sizeof structure at compile time
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//
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/// Output the sizeof a structure at compile time.
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/// This stops the compiler with an error (good) containing the size of the target
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/// in the message.
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///
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/// example: struct foo {}; IRCD_TEST_SIZEOF(foo)
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///
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#define IRCD_TEST_SIZEOF(name) \
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ircd::util::_TEST_SIZEOF_<sizeof(name)> _test_;
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/// Internal use only
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template<size_t SIZE>
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struct _TEST_SIZEOF_;
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//
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// Test if type is forward declared or complete
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//
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template<class T,
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class = void>
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struct is_complete
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:std::false_type
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{};
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template<class T>
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struct is_complete<T, decltype(void(sizeof(T)))>
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:std::true_type
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{};
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//
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// Test if type is a specialization of a template
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//
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template<class,
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template<class...>
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class>
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struct is_specialization_of
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:std::false_type
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{};
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template<template<class...>
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class T,
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class... args>
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struct is_specialization_of<T<args...>, T>
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:std::true_type
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{};
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//
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// Test if type is shared_from_this
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//
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/// Tests if type inherits from std::enable_shared_from_this<>
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template<class T>
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constexpr typename std::enable_if<is_complete<T>::value, bool>::type
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is_shared_from_this()
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{
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return std::is_base_of<std::enable_shared_from_this<T>, T>();
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}
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/// Unconditional failure for fwd-declared incomplete types, which
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/// obviously don't inherit from std::enable_shared_from_this<>
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template<class T>
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constexpr typename std::enable_if<!is_complete<T>::value, bool>::type
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is_shared_from_this()
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{
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return false;
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}
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//
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// Misc type testing boilerplates
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//
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template<class T>
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constexpr bool
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is_bool()
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{
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using type = typename std::remove_reference<T>::type;
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return std::is_same<type, bool>::value;
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}
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template<class T>
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constexpr bool
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is_number()
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{
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using type = typename std::remove_reference<T>::type;
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return std::is_arithmetic<type>::value;
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}
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template<class T>
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constexpr bool
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is_floating()
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{
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using type = typename std::remove_reference<T>::type;
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return is_number<T>() && std::is_floating_point<type>();
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}
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template<class T>
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constexpr bool
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is_integer()
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{
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return is_number<T>() && !is_floating<T>();
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}
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//
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// Convenience constexprs for iterators
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//
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template<class It>
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constexpr auto
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is_iterator()
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{
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return std::is_base_of<typename std::iterator_traits<It>::value_type, It>::value;
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}
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template<class It>
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constexpr auto
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is_forward_iterator()
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{
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return std::is_base_of<std::forward_iterator_tag, typename std::iterator_traits<It>::iterator_category>::value;
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}
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template<class It>
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constexpr auto
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is_input_iterator()
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{
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return std::is_base_of<std::forward_iterator_tag, typename std::iterator_traits<It>::iterator_category>::value;
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}
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//
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// Completing std::remove_pointer<>
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//
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template<class T>
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struct remove_all_pointers
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{
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using type = T;
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};
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template<class T>
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struct remove_all_pointers<T *>
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{
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using type = typename remove_all_pointers<T>::type;
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};
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/// Convenience loop to test std::is* on a character sequence
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template<int (&test)(int) = std::isprint>
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ssize_t
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ctype(const char *const &begin,
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const char *const &end)
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{
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for(const char *it(begin); it != end; ++it)
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if(test(static_cast<unsigned char>(*it)) != 0)
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return std::distance(begin, it);
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return -1;
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}
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/// ctype test for a const_buffer. Returns the character position where the
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/// test fails. Returns -1 on success. The test is a function specified in
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/// the template simply as `ctype<std::isprint>(const_buffer{"hi"});` which
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/// should fail because const_buffer's over a string literal see the trailing
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/// null character.
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template<int (*test)(int)>
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ssize_t
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ctype(const const_buffer &s)
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{
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return ctype<test>(begin(s), end(s));
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}
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/// Boolean alternative for ctype(const_buffer)
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template<int (*test)(int)>
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bool
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all_of(const const_buffer &s)
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{
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return std::all_of(begin(s), end(s), [](const char &c)
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{
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return test(c) != 0;
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});
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}
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/// Boolean alternative for ctype(const_buffer)
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template<int (*test)(int)>
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bool
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none_of(const const_buffer &s)
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{
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return std::all_of(begin(s), end(s), [](const char &c)
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{
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return test(c) == 0;
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});
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}
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/// Zero testing functor (work in progress)
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///
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struct is_zero
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{
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template<class T>
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typename std::enable_if
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<
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is_bool<T>(),
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bool>::type
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test(const bool &value)
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const
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{
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return !value;
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}
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template<class T>
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typename std::enable_if
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<
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is_integer<T>() &&
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!is_bool<T>(),
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bool>::type
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test(const size_t &value)
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const
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{
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return value == 0;
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}
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template<class T>
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typename std::enable_if
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<
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is_floating<T>() &&
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!is_bool<T>(),
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bool>::type
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test(const double &value)
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const
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{
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return !(value > 0.0 || value < 0.0);
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}
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template<class T>
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bool operator()(T&& t)
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const
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{
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return test<T>(std::forward<T>(t));
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}
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};
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} // namespace util
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} // namespace ircd
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