FTXUI/include/ftxui/util/ref.hpp

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#ifndef FTXUI_UTIL_REF_HPP
#define FTXUI_UTIL_REF_HPP
#include <ftxui/screen/string.hpp>
#include <string>
namespace ftxui {
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/// @brief An adapter. Own or reference an immutable object.
template <typename T>
class ConstRef {
public:
ConstRef() {}
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ConstRef(T t) : owned_(t) {}
ConstRef(const T* t) : address_(t) {}
const T& operator*() { return address_ ? *address_ : owned_; }
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const T& operator()() { return address_ ? *address_ : owned_; }
const T* operator->() { return address_ ? address_ : &owned_; }
private:
T owned_;
const T* address_ = nullptr;
};
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/// @brief An adapter. Own or reference an mutable object.
template <typename T>
class Ref{
public:
Ref() {}
Ref(T t) : owned_(t) {}
Ref(T* t) : address_(t) {}
T& operator*() { return address_ ? *address_ : owned_; }
T& operator()() { return address_ ? *address_ : owned_; }
T* operator->() { return address_ ? address_ : &owned_; }
private:
T owned_;
T* address_ = nullptr;
};
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/// @brief An adapter. Own or reference a constant string. For convenience, this
/// class convert multiple mutable string toward a shared representation.
class StringRef {
public:
StringRef(std::wstring* ref) : address_(ref) {}
StringRef(std::wstring ref) : owned_(std::move(ref)) {}
StringRef(const wchar_t* ref) : StringRef(std::wstring(ref)) {}
StringRef(const char* ref) : StringRef(to_wstring(std::string(ref))) {}
std::wstring& operator*() { return address_ ? *address_ : owned_; }
std::wstring* operator->() { return address_ ? address_ : &owned_; }
private:
std::wstring owned_;
std::wstring* address_ = nullptr;
};
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/// @brief An adapter. Own or reference a constant string. For convenience, this
/// class convert multiple immutable string toward a shared representation.
class ConstStringRef {
public:
ConstStringRef(const std::wstring* ref) : address_(ref) {}
ConstStringRef(std::wstring ref) : owned_(std::move(ref)) {}
ConstStringRef(const wchar_t* ref) : ConstStringRef(std::wstring(ref)) {}
ConstStringRef(const char* ref)
: ConstStringRef(to_wstring(std::string(ref))) {}
const std::wstring& operator*() { return address_ ? *address_ : owned_; }
const std::wstring* operator->() { return address_ ? address_ : &owned_; }
private:
const std::wstring owned_;
const std::wstring* address_ = nullptr;
};
} // namespace ftxui
#endif /* end of include guard: FTXUI_UTIL_REF_HPP */
// Copyright 2020 Arthur Sonzogni. All rights reserved.
// Use of this source code is governed by the MIT license that can be found in
// the LICENSE file.