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Questions - c11

Is _Thread_local independent from __STDC_NO_THREADS__?

It seems that currently _Thread_local is independent from __STDC_NO_THREADS__. Consequence: even if an implementation defines __STDC_NO_THREADS__ to 1, then it still needs to support (at least to acce...
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pmor

c

language-lawyer

c11

Votes: 0

Answers: 2

Latest Answer

That is correct but it's not necessarily a defect _Thread_local is a storage duration added to the C programming language with the release of C11, and you're right, it is not explicitly associated wit...
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Willis Hershey

Is a string literal converted to bool valid as part of a constant initializer expression?

enum { compile_time_assertion = 1 / ("description" && 1); }; Does the above snippet conform to C11? Having a string literal as part of the expression may violate one of the many c...
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Roland Illig

language-lawyer

c11

compile-time-constant

Votes: 0

Answers: 1

Latest Answer

Enumeration constants need "integer constant expressions" (ICE): The expression that defines the value of an enumeration constant shall be an integer constant expression that has a value re...
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Jens Gustedt

How to create a vector of objects efficiently in C++？

vector<vector<int>> v(100, vector<int>(100)); // 101 vector<int> are created I need to created a vector of vectors (or objects) like above. But then there will be 101 vector&l...
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Xiaofeng Zheng

c++

c99

c11

Votes: 0

Answers: 1

Latest Answer

I guess the std::vector could handle this case with move semantics emplacing the first vector(100) at index 0 and doing 99 copies. But it doesn't. But you can easily do that yourself: vector<vector...
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Goswin von Brederlow

_Static_assert in unused generic selection

It looks like the typeof operator is likely to be accepted into the next C standard, and I was looking to see if there was a way to leverage this to create a macro using portable ISO-C that can get th...
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Christian Gibbons

c

language-lawyer

c11

Votes: 0

Answers: 3

Latest Answer

It doesn't matter which generic selection is evaluated. When the expression that is part of a _Status_assert has the value 0, this is considered a constraint violation and the compiler is required to ...
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dbush

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