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#include <sstream>
#include <string>
#include <vector>
#include <functional>
std::string to_lower(const std::string& str);
template <typename T>
std::string join(const T& values, const std::string& delim)
{
std::ostringstream ss;
for (const auto& v : values) {
if (&v != &values[0])
ss << delim;
ss << v;
}
return ss.str();
}
template <typename T>
std::string join(const std::vector<T>& values, const std::string& delim, std::function<std::string(T)> func)
{
std::ostringstream ss;
for (const auto& v : values) {
if (&v != &values[0])
ss << delim;
ss << func(v);
}
return ss.str();
}
std::string sformat(const char *fmt, ...)
__attribute__ ((format (printf, 1, 2)));
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