Multi-user gravity beats for Sound of Science 2013 (server)
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#pragma once
#include "json.h"
struct Identity{
template <typename T>
T operator()(T t) const {
return t;
struct All{
template <typename T>
bool operator()(T const & t) const {
return true;
template <typename C, typename F1 = Identity, typename F2 = All>
inline js::Value vector_to_json(C const & container, F1 const & transform = Identity(), F2 const & filter = All()){
js::Array array;
for(auto x : container){
if(!filter(x)) continue;
return array;