Function random_string

unit_tests/common/temporary_file.hpp:11–34

#include <string>

inline std::string random_string(std::string::size_type length)
{
    static auto &chrs = "0123456789"
                        "abcdefghijklmnopqrstuvwxyz"
                        "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

    // Mix in the address of a local static as a per-process salt (ASLR)
    // to avoid filename collisions when tests run in parallel, while
    // preserving deterministic sequences within a single process.
    thread_local static std::mt19937 rg{
        osrm::test::getTestRandomSeed() ^
        static_cast<unsigned>(reinterpret_cast<std::uintptr_t>(&chrs))};
    thread_local static std::uniform_int_distribution<std::string::size_type> pick(
        0, sizeof(chrs) - 2);

    std::string s;
    s.reserve(length);

    while (length--)
    {
        s += chrs[pick(rg)];
    }
    return s;
}

struct TemporaryFile
{