39 lines
2.2 KiB
C
39 lines
2.2 KiB
C
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#pragma once
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// Turns an preprocessor token into a real string
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#define PREPROCESSOR_TO_STRING(X) PREPROCESSOR_TO_STRING_INNER(X)
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#define PREPROCESSOR_TO_STRING_INNER(X) #X
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// Concatenates two preprocessor tokens, performing macro expansion on them first
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#define PREPROCESSOR_JOIN(X, Y) PREPROCESSOR_JOIN_INNER(X, Y)
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#define PREPROCESSOR_JOIN_INNER(X, Y) X##Y
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// Concatenates the first two preprocessor tokens of a variadic list, after performing macro expansion on them
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#define PREPROCESSOR_JOIN_FIRST(X, ...) PREPROCESSOR_JOIN_FIRST_INNER(X, __VA_ARGS__)
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#define PREPROCESSOR_JOIN_FIRST_INNER(X, ...) X##__VA_ARGS__
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// Expands to the second argument or the third argument if the first argument is 1 or 0 respectively
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#define PREPROCESSOR_IF(Condition, X, Y) PREPROCESSOR_JOIN(PREPROCESSOR_IF_INNER_, Condition)(X, Y)
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#define PREPROCESSOR_IF_INNER_1(X, Y) X
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#define PREPROCESSOR_IF_INNER_0(X, Y) Y
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// Expands to the parameter list of the macro - used for when you need to pass a comma-separated identifier to another macro as a single parameter
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#define PREPROCESSOR_COMMA_SEPARATED(First, Second, ...) First, Second, ##__VA_ARGS__
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// Expands to nothing - used as a placeholder
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#define PREPROCESSOR_NOTHING
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// Removes a single layer of parentheses from a macro argument if they are present - used to allow
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// brackets to be optionally added when the argument contains commas, e.g.:
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//
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// #define DEFINE_VARIABLE(Type, Name) PREPROCESSOR_REMOVE_OPTIONAL_PARENS(Type) Name;
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//
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// DEFINE_VARIABLE(int, IntVar) // expands to: int IntVar;
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// DEFINE_VARIABLE((TPair<int, float>), PairVar) // expands to: TPair<int, float> PairVar;
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#define PREPROCESSOR_REMOVE_OPTIONAL_PARENS(...) PREPROCESSOR_JOIN_FIRST(PREPROCESSOR_REMOVE_OPTIONAL_PARENS_IMPL,PREPROCESSOR_REMOVE_OPTIONAL_PARENS_IMPL __VA_ARGS__)
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#define PREPROCESSOR_REMOVE_OPTIONAL_PARENS_IMPL(...) PREPROCESSOR_REMOVE_OPTIONAL_PARENS_IMPL __VA_ARGS__
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#define PREPROCESSOR_REMOVE_OPTIONAL_PARENS_IMPLPREPROCESSOR_REMOVE_OPTIONAL_PARENS_IMPL
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// Creates a string that can be used to include a header in the form "Platform/Header.h", like "Windows/Platform.h"
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#define COMPILED_PLATFORM_HEADER(Suffix) PREPROCESSOR_TO_STRING(PREPROCESSOR_JOIN(PLATFORM_HEADER_NAME/, Suffix))
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