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90 lines
2.9 KiB
C++
90 lines
2.9 KiB
C++
/*
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* Copyright (c) Contributors to the Open 3D Engine Project
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*
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* SPDX-License-Identifier: Apache-2.0 OR MIT
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*
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*/
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// Description : Facilities for defining and combining general-purpose or specific options, for functions or structs.
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#ifndef CRYINCLUDE_CRYCOMMON_OPTIONS_H
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#define CRYINCLUDE_CRYCOMMON_OPTIONS_H
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#pragma once
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// Facilities for collecting options in a struct, and quickly constructing them.
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// Used, for example, as construction argument. Safer and more informative than bool arguments.
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//
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// Example:
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// struct FObjectOpts;
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// struct CObject { CObject(FObjectOpts = ZERO); };
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// CObject object_def();
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// CObject object( FObjectOpts().Size(8).AllowGrowth(true) );
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template<class TOpt, class T, class TContainer, int NInit = 0>
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struct TOptVar
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{
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typedef T TValue;
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TOptVar()
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: _val(T(NInit))
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{
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offset(this);
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}
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TOptVar(T val)
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: _val(val) {}
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operator T () const
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{
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return _val;
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}
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T operator ()() const
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{ return _val; }
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T operator +() const
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{ return _val; }
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bool operator !() const
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{ return !_val; }
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TContainer& operator()(T val)
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{
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_val = val;
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return *(TContainer*)((char*)this - offset());
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}
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private:
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T _val;
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static size_t offset(void* self = 0)
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{
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static size_t _offset = TContainer::static_offset(self);
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return _offset;
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}
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};
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#define OPT_STRUCT(TOpts) \
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typedef TOpts TThis; typedef uint TInt; \
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static size_t static_offset(void* var) { static void* _first = var; return (char*)var - (char*)_first; } \
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TOpts([[maybe_unused]] void* p = 0) {} \
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TOpts operator()() const { return TOpts(*this); } \
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#define OPT_VAR(Type, Var) \
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enum E##Var {}; TOptVar<E##Var, Type, TThis> Var; \
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#define OPT_VAR_INIT(Type, Var, init) \
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enum E##Var {}; TOptVar<E##Var, Type, TThis, init> Var; \
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#define BIT_STRUCT(Struc, Int) \
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typedef Struc TThis; typedef Int TInt; \
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TInt Mask() const { return *(const TInt*)this; } \
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TInt& Mask() { return *(TInt*)this; } \
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Struc(TInt init = 0) { COMPILE_TIME_ASSERT(sizeof(TThis) == sizeof(TInt)); Mask() = init; } \
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#define BIT_VAR(Var) \
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TInt _##Var : 1; \
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bool Var() const { return _##Var; } \
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TThis& Var(bool val) { _##Var = val; return *this; } \
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#endif // CRYINCLUDE_CRYCOMMON_OPTIONS_H
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