Daniel Langr

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Daniel Langr has asked 74 questions and find answers to 182 problems.

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Daniel Langr questions

Does STLR(B) provide sequential consistency on ARM64?
Is MPL pos an undocumented metafunction?
Why string::replace does not specify allocator's exceptions in C++11?
GCC does not generate machine code for out-of-class defaulted copy constructor
GCC generates test for nonzeroness even if the zero value is guaranteed
std::construct_at vs placement new; additional move/copy constructor call
Why destructor needs to be accessible even when it is not called?
Why std::allocator<T>::allocate calls ::operator new?
Why is std::array<T,0> sized and aligned according to T in libc++?
Can a file stream destructor throw an exception in C++?

Daniel Langr answers

Confusing behaviour around mandatory elision of copy/move [duplicate]
Using in-place lambda for complex initialisation, especially consts
Parallel summation of the array is slower than the sequential one in C++
Why does t+=i+'a' give the correct output while t=t+i+'a' gives an error?
beginner questions about class and objects
Open MP : Symmetric matrix multiplication for Sparse matrices
Why does a friend operator require const-ness on its operands while a member operator does not?
Can b&&0 be optimized
why inserting into set with same amount has different runtimes based on different approaches?
Threads, how to seed random number generator independently?