可变参数宏技巧 [英] Variadic macro trick

问题描述

创建可变参数宏FOO(a1, a2, a3,..., an)以使其在您选择的任何预选有界范围内将n的值扩展到FOOn(a1, a2, a3,..., an)的窍门是什么?也就是说，FOO(a)应该扩展到FOO1(a)，FOO(a, b, c)扩展到FOO3(a, b, c)，依此类推.我知道有一个标准的技巧，但是我似乎找不到它.

What's the trick to create a variadic macro FOO(a1, a2, a3,..., an) such that it expands to FOOn(a1, a2, a3,..., an) for values of n in whatever preselected bounded range you choose? That is, FOO(a) should expand to FOO1(a), FOO(a, b, c) to FOO3(a, b, c), etc. I know there's a standard trick but I can't seem to find it.

请随时将此问题标记为重复，并在答案中还有其他问题时将其关闭.我怀疑有，但找不到.

Please feel free to mark this question as a duplicate and close it if there's another question with the answer. I suspect there is but I couldn't find it.

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This post Variadic macro to count number of arguments has what you're looking for I believe. Look at the first and second responses.

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