47 lines
2.1 KiB
C
47 lines
2.1 KiB
C
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#pragma once
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#include "CoreTypes.h"
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#include "TypeTraits/TypeTraits.h"
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#include <cstdarg>
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NAMESPACE_REDCRAFT_BEGIN
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NAMESPACE_MODULE_BEGIN(Redcraft)
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NAMESPACE_MODULE_BEGIN(Utility)
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NAMESPACE_PRIVATE_BEGIN
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template <typename T>
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struct TVarArgsAssert
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{
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static_assert(CArithmetic<T> || CEnum<T> || CPointer<T> || CMemberPointer<T> || CClass<T>, "The type must be arithmetic, enum, pointer, member pointer, or class");
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static_assert(!CNullPointer<T>, "The 'nullptr_t' is promoted to 'void*' when passed through '...'");
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static_assert(!CSameAs<T, float>, "The 'float' is promoted to 'double' when passed through '...'");
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static_assert(!CSameAs<T, bool>, "The 'bool' is promoted to 'int' when passed through '...'");
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static_assert(!CSameAs<T, char>, "The 'char' is promoted to 'int' when passed through '...'");
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static_assert(!CSameAs<T, short>, "The 'short' is promoted to 'int' when passed through '...'");
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static_assert(CSameAs<T, TRemoveCV<T>>, "The 'const' and 'volatile' qualifiers are removed when passed through '...'");
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static_assert(!CEnum<T> || CScopedEnum<T>, "The unscoped enum is promoted to 'int' when passed through '...'");
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static_assert(!CClass<T> || CTriviallyCopyable<T>, "The non-trivially copyable class is not supported");
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};
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template <typename T> inline constexpr TVarArgsAssert<T> VarArgsAssert{ };
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NAMESPACE_PRIVATE_END
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/** Enables access to variadic function arguments. */
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#define VARARGS_ACCESS_BEGIN(ContextName, NamedParam) NAMESPACE_STD::va_list ContextName; va_start(ContextName, NamedParam)
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/** Makes a copy of the variadic function arguments. */
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#define VARARGS_ACCESS_COPY(ContextName, ContextSource) NAMESPACE_STD::va_list ContextName; va_copy(ContextName, ContextSource)
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/** Accesses the next variadic function argument. */
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#define VARARGS_ACCESS(ContextName, Type) (NAMESPACE_PRIVATE::VarArgsAssert<Type>, va_arg(ContextName, Type))
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/** Ends traversal of the variadic function arguments. */
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#define VARARGS_ACCESS_END(ContextName) va_end(ContextName)
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NAMESPACE_MODULE_END(Utility)
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NAMESPACE_MODULE_END(Redcraft)
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NAMESPACE_REDCRAFT_END
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