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https://github.com/ArthurSonzogni/FTXUI.git
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63e8dadad9
ftxui::Ref<> is used for passing Options, for instance, MenuOption, to the corresponding component which is supposed to hold a strong reference of it. and we can observe the events sent to the component by setting callback(s) in the option instance passed to the owner component. but the callback function is not always copyable, despite that it might be moveable. in this change, * Make<>() is updated to use the perfect forwarding to avoid enforcing its parameters to be copyable. * Ref<> is also updated to take a rvalue reference, so we can move away from the contructor parameter when creating an instance of Ref<>() from it. Signed-off-by: Kefu Chai <tchaikov@gmail.com>
119 lines
3.9 KiB
C++
119 lines
3.9 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 mutable string toward a shared representation.
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class WideStringRef {
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public:
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WideStringRef(std::wstring* ref) : address_(ref) {}
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WideStringRef(std::wstring ref) : owned_(std::move(ref)) {}
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WideStringRef(const wchar_t* ref) : WideStringRef(std::wstring(ref)) {}
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WideStringRef(const char* ref)
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: WideStringRef(to_wstring(std::string(ref))) {}
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std::wstring& operator*() { return address_ ? *address_ : owned_; }
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std::wstring* operator->() { return address_ ? address_ : &owned_; }
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private:
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std::wstring owned_;
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std::wstring* 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 { 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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