Function duplicate

pyvrp/cpp/ProblemData.cpp:21–26

Small local helper for what is essentially strdup() from the C23 standard, which my compiler does not (yet) have. See here for the actual recipe: https://stackoverflow.com/a/252802/4316405 (modified to use new instead of malloc). We do all this so we can use C-style strings, rather than C++'s std::string, which are much larger objects.

// malloc). We do all this so we can use C-style strings, rather than C++'s
// std::string, which are much larger objects.
static char *duplicate(char const *src)
{
    char *dst = new char[std::strlen(src) + 1];  // space for src + null
    std::strcpy(dst, src);
    return dst;
}

// Pad vec1 with zeroes to the size of vec1 and vec2, whichever is larger.
auto &pad(auto &vec1, auto const &vec2)