mirror of
https://github.com/bsnes-emu/bsnes.git
synced 2025-04-02 10:42:14 -04:00
94b2538af5
byuu says: Basically just a project rename, with s/bsnes/higan and the new icon from lowkee added in. It won't compile on Windows because I forgot to update the resource.rc file, and a path transform command isn't working on Windows. It was really just meant as a starting point, so that v091 WIPs can flow starting from .00 with the new name (it overshadows bsnes v091, so publicly speaking this "shouldn't exist" and will probably be deleted from Google Code when v092 is ready.)
91 lines
3 KiB
C++
Executable file
91 lines
3 KiB
C++
Executable file
#ifndef NALL_PROPERTY_HPP
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#define NALL_PROPERTY_HPP
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//nall::property implements ownership semantics into container classes
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//example: property<owner>::readonly<type> implies that only owner has full
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//access to type; and all other code has readonly access.
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//
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//this code relies on extended friend semantics from C++0x to work, as it
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//declares a friend class via a template paramter. it also exploits a bug in
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//G++ 4.x to work even in C++98 mode.
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//
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//if compiling elsewhere, simply remove the friend class and private semantics
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//property can be used either of two ways:
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//struct foo {
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// property<foo>::readonly<bool> x;
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// property<foo>::readwrite<int> y;
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//};
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//-or-
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//struct foo : property<foo> {
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// readonly<bool> x;
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// readwrite<int> y;
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//};
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//return types are const T& (byref) instead of T (byval) to avoid major speed
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//penalties for objects with expensive copy constructors
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//operator-> provides access to underlying object type:
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//readonly<Object> foo;
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//foo->bar();
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//... will call Object::bar();
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//operator='s reference is constant so as to avoid leaking a reference handle
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//that could bypass access restrictions
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//both constant and non-constant operators are provided, though it may be
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//necessary to cast first, for instance:
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//struct foo : property<foo> { readonly<int> bar; } object;
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//int main() { int value = const_cast<const foo&>(object); }
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//writeonly is useful for objects that have non-const reads, but const writes.
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//however, to avoid leaking handles, the interface is very restricted. the only
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//way to write is via operator=, which requires conversion via eg copy
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//constructor. example:
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//struct foo {
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// foo(bool value) { ... }
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//};
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//writeonly<foo> bar;
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//bar = true;
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namespace nall {
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template<typename C> struct property {
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template<typename T> struct traits { typedef T type; };
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template<typename T> struct readonly {
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const T* operator->() const { return &value; }
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const T& operator()() const { return value; }
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operator const T&() const { return value; }
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private:
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T* operator->() { return &value; }
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operator T&() { return value; }
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const T& operator=(const T& value_) { return value = value_; }
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T value;
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friend class traits<C>::type;
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};
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template<typename T> struct writeonly {
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void operator=(const T& value_) { value = value_; }
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private:
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const T* operator->() const { return &value; }
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const T& operator()() const { return value; }
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operator const T&() const { return value; }
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T* operator->() { return &value; }
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operator T&() { return value; }
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T value;
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friend class traits<C>::type;
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};
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template<typename T> struct readwrite {
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const T* operator->() const { return &value; }
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const T& operator()() const { return value; }
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operator const T&() const { return value; }
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T* operator->() { return &value; }
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operator T&() { return value; }
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const T& operator=(const T& value_) { return value = value_; }
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T value;
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};
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};
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}
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#endif
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