https://bugs.llvm.org/show_bug.cgi?id=49621
Bug ID: 49621
Summary: std::shuffle() hangs with clang but works well with
gcc/msvs
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected]
Confirmed on Linux and Mac. Discovered with Michail Kalashnikov.
clang -v
Apple clang version 12.0.0 (clang-1200.0.32.29)
Target: x86_64-apple-darwin20.3.0
Thread model: posix
InstalledDir: /Applications/
Reproducer: https://rextester.com/ZMML24952
#include <iostream>
#include <vector>
#include <algorithm>
#include <random>
using namespace std;
int shuffler_fn(int i) {
//cout << "Shuffler: " << i << endl;
return std::rand() % i;
}
void random_shuffle() {
vector<int> rows{1, 2, 3, 4, 5, 6, 7, 8, 9, 0};
std::random_shuffle(rows.begin(), rows.end(), shuffler_fn);
for (const auto& item : rows) {
cout << item << ' ';
}
}
class Shuffler {
public:
typedef int result_type;
static constexpr int min() { return 0; }
static constexpr int max() { return RAND_MAX; }
int operator()() const { return std::rand(); }
};
void just_shuffle() {
vector<int> rows{1, 2, 3, 4, 5, 6, 7, 8, 9, 0};
Shuffler shuffler;
std::shuffle(rows.begin(), rows.end(), shuffler);
for (const auto& item : rows) {
cout << item << ' ';
}
}
int main()
{
random_shuffle();
cout << endl;
just_shuffle();
cout << endl;
return 0;
}
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