xorshift32 (usable with std::shuffle and more)

xs32.cpp

#include<bits/stdc++.h>
using namespace std;
using u32=uint32_t;
struct xorshift32_gen
{
    const u32 default_seed = 1;
    u32 cur;
    using result_type=u32;
    xorshift32_gen():cur(default_seed){}
    xorshift32_gen(u32 sd):cur(sd){}
    void seed(u32 sd){cur=sd;}
    constexpr static u32 min(){return 1;}
    constexpr static u32 max(){return 4294967295;}
    u32 operator()()
    {
        u32 tmp=cur;
        cur^=cur<<13;
        cur^=cur>>17;
        cur^=cur<<5;
        return tmp;
    }
};