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18 lines
698 B
18 lines
698 B
2 years ago
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#include "utils.h"
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#include <random>
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#include <chrono>
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using std::string;
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string base62uuid(int l = 8) {
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using namespace std;
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constexpr static const char* base62alp = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
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static mt19937_64 engine(chrono::system_clock::now().time_since_epoch().count());
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static uniform_int_distribution<uint64_t> u(0x10000, 0xfffff);
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uint64_t uuid = (u(engine) << 32ull) + (chrono::system_clock::now().time_since_epoch().count() & 0xffffffff);
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printf("%llx\n", uuid);
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string ret;
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while (uuid && l-- >= 0) {
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ret = string("") + base62alp[uuid % 62] + ret;
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uuid /= 62;
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}
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return ret;
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}
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