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https://github.com/ArthurSonzogni/FTXUI.git
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105 lines
3.3 KiB
C++
105 lines
3.3 KiB
C++
#ifndef FTXUI_UTIL_REF_HPP
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#define FTXUI_UTIL_REF_HPP
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#include <ftxui/screen/string.hpp>
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#include <string>
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namespace ftxui {
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/// @brief An adapter. Own or reference an immutable object.
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template <typename T>
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class ConstRef {
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public:
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ConstRef() {}
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ConstRef(T t) : owned_(t) {}
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ConstRef(const T* t) : address_(t) {}
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const T& operator*() const { return address_ ? *address_ : owned_; }
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const T& operator()() const { return address_ ? *address_ : owned_; }
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const T* operator->() const { return address_ ? address_ : &owned_; }
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private:
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T owned_;
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const T* address_ = nullptr;
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};
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/// @brief An adapter. Own or reference an mutable object.
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template <typename T>
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class Ref {
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public:
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Ref() {}
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Ref(const T& t) : owned_(t) {}
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Ref(T&& t) : owned_(std::forward<T>(t)) {}
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Ref(T* t) : address_(t) {}
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T& operator*() { return address_ ? *address_ : owned_; }
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T& operator()() { return address_ ? *address_ : owned_; }
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T* operator->() { return address_ ? address_ : &owned_; }
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private:
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T owned_;
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T* address_ = nullptr;
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};
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/// @brief An adapter. Own or reference a constant string. For convenience, this
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/// class convert multiple mutable string toward a shared representation.
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class StringRef {
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public:
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StringRef(std::string* ref) : address_(ref) {}
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StringRef(std::string ref) : owned_(std::move(ref)) {}
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StringRef(const wchar_t* ref) : StringRef(to_string(std::wstring(ref))) {}
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StringRef(const char* ref) : StringRef(std::string(ref)) {}
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std::string& operator*() { return address_ ? *address_ : owned_; }
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std::string* operator->() { return address_ ? address_ : &owned_; }
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private:
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std::string owned_;
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std::string* address_ = nullptr;
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};
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/// @brief An adapter. Own or reference a constant string. For convenience, this
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/// class convert multiple immutable string toward a shared representation.
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class ConstStringRef {
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public:
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ConstStringRef(const std::string* ref) : address_(ref) {}
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ConstStringRef(const std::wstring* ref) : ConstStringRef(to_string(*ref)) {}
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ConstStringRef(std::string ref) : owned_(std::move(ref)) {}
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ConstStringRef(std::wstring ref) : ConstStringRef(to_string(ref)) {}
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ConstStringRef(const wchar_t* ref) : ConstStringRef(std::wstring(ref)) {}
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ConstStringRef(const char* ref)
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: ConstStringRef(to_wstring(std::string(ref))) {}
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const std::string& operator()() const {
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return address_ ? *address_ : owned_;
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}
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const std::string& operator*() const { return address_ ? *address_ : owned_; }
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const std::string* operator->() const {
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return address_ ? address_ : &owned_;
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}
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private:
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const std::string owned_;
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const std::string* address_ = nullptr;
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};
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/// @brief An adapter. Reference a list of strings.
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class ConstStringListRef {
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public:
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ConstStringListRef(const std::vector<std::string>* ref) : ref_(ref) {}
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ConstStringListRef(const std::vector<std::wstring>* ref) : ref_wide_(ref) {}
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size_t size() const { return ref_ ? ref_->size() : ref_wide_->size(); }
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std::string operator[](size_t i) const {
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return ref_ ? (*ref_)[i] : to_string((*ref_wide_)[i]);
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}
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private:
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const std::vector<std::string>* ref_ = nullptr;
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const std::vector<std::wstring>* ref_wide_ = nullptr;
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};
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} // namespace ftxui
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#endif /* end of include guard: FTXUI_UTIL_REF_HPP */
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// Copyright 2020 Arthur Sonzogni. All rights reserved.
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// Use of this source code is governed by the MIT license that can be found in
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// the LICENSE file.
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