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#ifndef utils_hh_INCLUDED
#define utils_hh_INCLUDED
#include "exception.hh"
#include "assert.hh"
#include <memory>
#include <algorithm>
namespace Kakoune
{
// *** Singleton ***
//
// Singleton helper class, every singleton type T should inherit
// from Singleton<T> to provide a consistent interface.
template<typename T>
class Singleton
{
public:
Singleton(const Singleton&) = delete;
Singleton& operator=(const Singleton&) = delete;
static T& instance()
{
assert (ms_instance);
return *ms_instance;
}
static void delete_instance()
{
delete ms_instance;
ms_instance = nullptr;
}
protected:
Singleton()
{
assert(not ms_instance);
ms_instance = static_cast<T*>(this);
}
~Singleton()
{
assert(ms_instance == this);
ms_instance = nullptr;
}
private:
static T* ms_instance;
};
template<typename T>
T* Singleton<T>::ms_instance = nullptr;
// *** safe_ptr: objects that assert nobody references them when they die ***
template<typename T>
class safe_ptr
{
public:
safe_ptr() : m_ptr(nullptr) {}
explicit safe_ptr(T* ptr) : m_ptr(ptr) { if (ptr) ptr->inc_safe_count(); }
safe_ptr(const safe_ptr& other) : safe_ptr(other.m_ptr) {}
safe_ptr(safe_ptr&& other) : m_ptr(other.m_ptr) { other.m_ptr = nullptr; }
~safe_ptr() { if (m_ptr) m_ptr->dec_safe_count(); }
safe_ptr& operator=(const safe_ptr& other)
{
if (m_ptr != other.m_ptr)
{
if (m_ptr)
m_ptr->dec_safe_count();
m_ptr = other.m_ptr;
if (m_ptr)
m_ptr->inc_safe_count();
}
return *this;
}
safe_ptr& operator=(safe_ptr&& other)
{
if (m_ptr != other.m_ptr)
{
if (m_ptr)
m_ptr->dec_safe_count();
m_ptr = other.m_ptr;
other.m_ptr = nullptr;
}
return *this;
}
void reset(T* ptr)
{
*this = safe_ptr(ptr);
}
bool operator== (const safe_ptr& other) const { return m_ptr == other.m_ptr; }
bool operator!= (const safe_ptr& other) const { return m_ptr != other.m_ptr; }
bool operator== (T* ptr) const { return m_ptr == ptr; }
bool operator!= (T* ptr) const { return m_ptr != ptr; }
T& operator* () const { return *m_ptr; }
T* operator-> () const { return m_ptr; }
T* get() const { return m_ptr; }
explicit operator bool() const { return m_ptr; }
private:
T* m_ptr;
};
class SafeCountable
{
public:
SafeCountable() : m_count(0) {}
~SafeCountable() { assert(m_count == 0); }
void inc_safe_count() const { ++m_count; }
void dec_safe_count() const { --m_count; assert(m_count >= 0); }
private:
mutable int m_count;
};
// *** Containers helpers ***
template<typename Container>
struct ReversedContainer
{
ReversedContainer(Container& container) : container(container) {}
Container& container;
decltype(container.rbegin()) begin() { return container.rbegin(); }
decltype(container.rend()) end() { return container.rend(); }
};
template<typename Container>
ReversedContainer<Container> reversed(Container& container)
{
return ReversedContainer<Container>(container);
}
template<typename Container, typename T>
auto find(Container& container, const T& value) -> decltype(container.begin())
{
return std::find(container.begin(), container.end(), value);
}
template<typename Container, typename T>
auto find_if(Container& container, T op) -> decltype(container.begin())
{
return std::find_if(container.begin(), container.end(), op);
}
template<typename Container, typename T>
bool contains(const Container& container, const T& value)
{
return find(container, value) != container.end();
}
// *** On scope end ***
//
// on_scope_end provides a way to register some code to be
// executed when current scope closes.
//
// usage:
// auto cleaner = on_scope_end([]() { ... });
//
// This permits to cleanup c-style resources without implementing
// a wrapping class
template<typename T>
class OnScopeEnd
{
public:
OnScopeEnd(T func) : m_func(func) {}
~OnScopeEnd() { m_func(); }
private:
T m_func;
};
template<typename T>
OnScopeEnd<T> on_scope_end(T t)
{
return OnScopeEnd<T>(t);
}
// *** Misc helper functions ***
template<typename T>
bool operator== (const std::unique_ptr<T>& lhs, T* rhs)
{
return lhs.get() == rhs;
}
inline String escape(const String& name)
{
return name.replace("([ \\t;])", R"(\\\1)");
}
template<typename T>
const T& clamp(const T& val, const T& min, const T& max)
{
return (val < min ? min : (val > max ? max : val));
}
}
#endif // utils_hh_INCLUDED
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