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Questions - c++17

Why in order to use default constructor in Derived Class, we need a default constructor in the Base Class

As you have seen in the title i need to find the error in the code bellow, Here is what i know: I know that in order to use default constructor in B, we need a default constructor in A What i don't ...
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louis clement

c++

inheritance

c++17

default-constructor

Votes: 0

Answers: 2

Latest Answer

I think your title is misleading, but the question is valid. In order to construct B, A needs to be constructed as well (that you know) but how can A be constructed without knowing the value of int i ...
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Tomer W

std::filesystem::remove_all fails on read-only file

I am trying to remove a complete git repository clone from my disk using std::filesystem::remove_all() std::filesystem::remove_all( myRepoName ); This throws an exception terminate called after throw...
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ravenspoint

c++

windows

c++17

git-for-windows

std-filesystem

Votes: 0

Answers: 1

Latest Answer

This code solves the problem by changing the readonly permission of any file that fails to delete. int count = 0; while (count < 5) //give up after 5, there should be just 2 in a git repo { ...
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ravenspoint

Using std::nullopt as a default value for an std::optional argument in C++17

This is a standard / good coding practice question. I've recently started using std::optional in my codebase. I think it's great (and verbose) for specifying an argument that's optional, so long as a ...
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heothesennoc

c++

c++17

default-arguments

stdoptional

Votes: 0

Answers: 1

Latest Answer

Yes, that is perfectly fine. It may be slightly verbose, but the interface is very clear. The only problem is that if someone wants to specify the last optional parameter, they will also have to spec...
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Ayxan Haqverdili

boost::pfr with customized member

I'm trying to use boost::pfr for basic reflection, and it fails to compile when one of the member is customized type, like a class or struct, why is this? What's the way to fix it? I'm using C++17. //...
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fluter

c++

boost

reflection

c++17

Votes: 0

Answers: 2

Latest Answer

You need to provide operator<< for S1, as boost::pfr::io relies on it existing: std::ostream& operator<<(std::ostream& os, const S1& x) { return os << boost::pfr::io_...
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Vittorio Romeo

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