<random>: Cannot save/restore a ranlux48 object in a stream #437
Description
Describe the bug
It appears that the textual representation of ranlux48 is incorrect
Command-line test case
STL version (git commit or Visual Studio version): Visual Studio 2019 version 16.4 (but goes back effectively forever)
C:\Users\bion\Desktop>type test.cpp
#include <iostream>
#include <random>
#include <sstream>
template <typename RND> void check(const char *name) {
RND g1, g2;
std::cout << std::boolalpha << name << ": " << (g1 == g2);
std::stringstream s;
s << g1;
s >> g1;
std::cout << " " << (g1 == g2) << std::endl;
}
int main() {
check<std::ranlux48>("ranlux48");
check<std::ranlux24>("ranlux24");
check<std::mt19937>("mt19937");
}
C:\Users\bion\Desktop>cl /EHsc /W4 /WX /std:c++latest /nologo .\test.cpp
test.cpp
C:\Users\bion\Desktop>.\test.exe
ranlux48: true false
ranlux24: true true
mt19937: true true
C:\Users\bion\Desktop>
Expected behavior
ranlux48: true true
ranlux24: true true
mt19937: true true
This issue is a dual of Microsoft-internal VSO-104809 and DevCom-249085