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utils.cpp
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utils.cpp
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#include "utils.h"
#include <boost/format.hpp>
#include <iostream>
#include <numeric>
#include <unordered_map>
#include <vector>
#include <sstream>
#include <functional>
#include <regex>
namespace utils
{
double avg(const std::vector<double> &v)
{
return std::accumulate(v.begin(), v.end(), 0.0) / v.size();
}
bool is_number(const std::string & s)
{
return std::regex_match(s, std::regex("-?[0-9]+([.][0-9]+)?"));
}
void summarise_by_key(const std::unordered_map<std::string, std::vector<double>> &m,
std::function<double (std::vector<double>)> agg)
{
std::stringstream ss;
for (auto const& x : m)
{
std::string station = x.first;
std::vector<double> temperatures = x.second;
double t_avg = agg(temperatures);
std::cout << boost::format("Station: %-10s AVG: %.2f") % station % t_avg << std::endl;
}
}
}