Daniel Langr

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Daniel Langr has asked 73 questions and find answers to 180 problems.

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Daniel Langr questions

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++?
When to provide custom swap function in C++?

Daniel Langr answers

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?
Get type contained in variant at run time in C++?
Seemingly compiler-specific failure to convert 64 bit bitset to binary string representation