132 lines
2.8 KiB
C
132 lines
2.8 KiB
C
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//=========== Copyright Valve Corporation, All rights reserved. ===============//
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//
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// Purpose:
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//=============================================================================//
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#ifndef PANORAMACXX_H
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#define PANORAMACXX_H
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#ifdef _WIN32
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#pragma once
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#endif
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namespace panorama
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{
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// TEMPLATE CLASS integral_constant
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template<class _Ty,
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_Ty _Val>
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struct panorama_integral_constant
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{ // convenient template for integral constant types
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static const _Ty value = _Val;
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typedef _Ty value_type;
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typedef panorama_integral_constant<_Ty, _Val> type;
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operator value_type() const
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{ // return stored value
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return (value);
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}
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};
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typedef panorama_integral_constant<bool, true> true_type;
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typedef panorama_integral_constant<bool, false> false_type;
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// TEMPLATE CLASS _Cat_base
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template<bool>
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struct panorama_Cat_base
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: false_type
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{ // base class for type predicates
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};
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template<>
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struct panorama_Cat_base < true >
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: true_type
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{ // base class for type predicates
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};
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// TEMPLATE CLASS enable_if
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template<bool _Test,
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class _Ty = void>
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struct panorama_enable_if
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{ // type is undefined for assumed !_Test
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};
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template<class _Ty>
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struct panorama_enable_if < true, _Ty >
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{ // type is _Ty for _Test
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typedef _Ty type;
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};
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#define PANORAMA_IS_BASE_OF(_Base, _Der) \
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: panorama_Cat_base<__is_base_of(_Base, _Der)>
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// TEMPLATE CLASS is_base_of
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template<class _Base, class _Der>
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struct panorama_is_base_of PANORAMA_IS_BASE_OF( _Base, _Der )
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{ // determine whether _Base is a base of or the same as _Der
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};
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#define PANORAMA_IS_ENUM(_Ty) \
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: panorama_Cat_base<__is_enum(_Ty)>
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// TEMPLATE CLASS is_enum
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template<class _Ty>
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struct panorama_is_enum
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PANORAMA_IS_ENUM( _Ty )
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{ // determine whether _Ty is an enumerated type
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};
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// TEMPLATE CLASS is_lvalue_reference
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template<class _Ty>
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struct panorama_is_lvalue_reference
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: false_type
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{ // determine whether _Ty is an lvalue reference
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};
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template<class _Ty>
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struct panorama_is_lvalue_reference < _Ty& >
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: true_type
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{ // determine whether _Ty is an lvalue reference
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};
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// TEMPLATE remove_reference
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template<class _Ty>
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struct panorama_remove_reference
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{ // remove reference
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typedef _Ty type;
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};
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template<class _Ty>
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struct panorama_remove_reference < _Ty& >
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{ // remove reference
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typedef _Ty type;
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};
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template<class _Ty>
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struct panorama_remove_reference < _Ty&& >
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{ // remove rvalue reference
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typedef _Ty type;
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};
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// TEMPLATE FUNCTION forward
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template<class _Ty> inline
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_Ty&& panorama_forward( typename panorama_remove_reference<_Ty>::type& _Arg )
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{ // forward an lvalue
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return (static_cast<_Ty&&>(_Arg));
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}
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template<class _Ty> inline
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_Ty&& panorama_forward( typename panorama_remove_reference<_Ty>::type&& _Arg )
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{ // forward anything
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static_assert(!panorama_is_lvalue_reference<_Ty>::value, "bad forward call");
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return (static_cast<_Ty&&>(_Arg));
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}
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}
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#endif // PANORAMACXX_H
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