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#pragma once
#include "coding/varint.hpp"
#include "base/string_utils.hpp"
#include "base/assert.hpp"
#include <cstddef>
#include <cstdint>
#include <limits>
#include <string>
class StringNumericOptimal
{
std::string m_s;
public:
bool operator==(StringNumericOptimal const & rhs) const { return m_s == rhs.m_s; }
void Set(std::string const & s)
{
CHECK(!s.empty(), ());
m_s = s;
}
void Set(char const * p)
{
m_s = p;
CHECK(!m_s.empty(), ());
}
template <typename T>
void Set(T const & s)
{
m_s = strings::to_string(s);
CHECK(!m_s.empty(), ());
}
void Clear() { m_s.clear(); }
bool IsEmpty() const { return m_s.empty(); }
std::string const & Get() const { return m_s; }
/// First uint64_t value is:
/// - a number if low control bit is 1;
/// - a string size-1 if low control bit is 0;
template <typename TSink>
void Write(TSink & sink) const
{
// If string is a number and we have space for control bit
uint64_t n;
if (strings::to_uint64(m_s, n) && ((n << 1) >> 1) == n)
WriteVarUint(sink, ((n << 1) | 1));
else
{
size_t const sz = m_s.size();
ASSERT_GREATER(sz, 0, ());
WriteVarUint(sink, static_cast<uint32_t>((sz-1) << 1));
sink.Write(m_s.c_str(), sz);
}
}
template <typename TSource>
void Read(TSource & src)
{
uint64_t sz = ReadVarUint<uint64_t>(src);
if ((sz & 1) != 0)
m_s = strings::to_string(sz >> 1);
else
{
sz = (sz >> 1) + 1;
ASSERT_LESS_OR_EQUAL(sz, std::numeric_limits<size_t>::max(),
("sz is out of platform's range."));
m_s.resize(static_cast<size_t>(sz));
src.Read(&m_s[0], sz);
}
}
};
inline std::string DebugPrint(StringNumericOptimal const & s) { return s.Get(); }
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