John Zwinck

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John Zwinck has asked 124 questions and find answers to 953 problems.

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John Zwinck questions

LuaSocket FTP always times out
Rcpp: how to keep files generated by sourceCpp?
GCC 8 fails to compile make_shared<volatile int>()
Pandas: how to add missing columns to a DataFrame when assigning Series as row
Boost Intrusive unordered_set broken in 1.48 with GCC in C++11 mode
Is C scanf() prohibited from checking that integers are in range?
Is GCC miscompiling this code, or is it UB?
rPython installation fails, libpython not in linker paths
Python doctest hangs using ProcessPoolExecutor
Why do std::pair<long, long> and std::tuple<long, long> generate different code [duplicate]

John Zwinck answers

How does git LFS track and store binary data more efficiently than git?
Looping through big files takes hours in Python
Changing datetime column to integer number without loop
C/C++ Macro for null safe pointer access
Pointers to structs and printing
Modifying contents of a const std::vector<T> w/o UB
When working with stateless objects, is there still a performance benefit to marking them const?
Python - nested loop vs 'in' operator resulting in almost double runtime
extract non-nested list from pandas dataframe
What's the best way to setup a lookup table when indexes aren't sequential?