Re: [boost] C++17 and "Alice in Wonderland"

On 2021-03-24 at 14:46, Edward Diener via Boost wrote:

On 3/24/2021 12:42 AM, Felipe Magno de Almeida via Boost wrote:

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On Tue, Mar 23, 2021 at 5:13 PM Edward Diener via Boost wrote:

Hello Edward,

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I apologize for this non-Boost related post, but I ran into what I thought was a C++17 bug in clang ( also in vc++14.2 C++17 ), whose explanation to me of why it is not a bug really sounds like the non-logic of "Alice in Wonderland".

[snip]

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My bug report is at https://bugs.llvm.org/show_bug.cgi?id=49684 and the explanation given there just eludes me as to what C++17 is doing,

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Aren't consts ignored in function parameters?

Why are consts ignored in function parameters ? Is not void f(int const) different from void f(int) ? In one the argument passed can not be changed and in the other it can. How can they be the same ?

As a caller of the function, you cannot tell the difference. So why should they be different? :-)