127 lines
2.3 KiB
C++
127 lines
2.3 KiB
C++
#ifndef utils_hh_INCLUDED
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#define utils_hh_INCLUDED
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#include "assert.hh"
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#include <memory>
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namespace Kakoune
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{
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template<typename T, typename... Args>
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std::unique_ptr<T> make_unique(Args&&... args)
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{
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return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
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}
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template<size_t... I>
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struct IndexSequence
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{
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using Next = IndexSequence<I..., sizeof...(I)>;
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};
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template<size_t N>
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struct MakeIndexSequence
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{
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using Type = typename MakeIndexSequence<N-1>::Type::Next;
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};
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template<>
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struct MakeIndexSequence<0>
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{
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using Type = IndexSequence<>;
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};
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template<size_t N>
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constexpr typename MakeIndexSequence<N>::Type
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make_index_sequence() { return typename MakeIndexSequence<N>::Type{}; }
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// *** Singleton ***
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//
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// Singleton helper class, every singleton type T should inherit
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// from Singleton<T> to provide a consistent interface.
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template<typename T>
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class Singleton
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{
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public:
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Singleton(const Singleton&) = delete;
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Singleton& operator=(const Singleton&) = delete;
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static T& instance()
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{
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kak_assert (ms_instance);
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return *ms_instance;
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}
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static bool has_instance()
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{
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return ms_instance != nullptr;
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}
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protected:
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Singleton()
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{
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kak_assert(not ms_instance);
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ms_instance = static_cast<T*>(this);
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}
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~Singleton()
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{
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kak_assert(ms_instance == this);
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ms_instance = nullptr;
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}
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private:
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static T* ms_instance;
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};
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template<typename T>
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T* Singleton<T>::ms_instance = nullptr;
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// *** On scope end ***
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//
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// on_scope_end provides a way to register some code to be
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// executed when current scope closes.
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//
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// usage:
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// auto cleaner = on_scope_end([]() { ... });
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//
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// This permits to cleanup c-style resources without implementing
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// a wrapping class
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template<typename T>
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class OnScopeEnd
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{
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public:
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[[gnu::always_inline]]
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OnScopeEnd(T func) : m_func(std::move(func)) {}
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[[gnu::always_inline]]
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~OnScopeEnd() { m_func(); }
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private:
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T m_func;
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};
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template<typename T>
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OnScopeEnd<T> on_scope_end(T t)
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{
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return OnScopeEnd<T>(t);
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}
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// *** Misc helper functions ***
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template<typename T>
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bool operator== (const std::unique_ptr<T>& lhs, T* rhs)
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{
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return lhs.get() == rhs;
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}
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template<typename T>
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const T& clamp(const T& val, const T& min, const T& max)
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{
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return (val < min ? min : (val > max ? max : val));
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}
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}
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#endif // utils_hh_INCLUDED
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