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#pragma once
#include "coding/varint.hpp"
#include "base/string_utils.hpp"
#include "base/assert.hpp"
#include "std/limits.hpp"
#include "std/string.hpp"
class StringNumericOptimal
{
string m_s;
public:
inline bool operator== (StringNumericOptimal const & rhs) const
{
return m_s == rhs.m_s;
}
inline void Set(string const & s)
{
CHECK ( !s.empty(), () );
m_s = s;
}
inline void Set(char const * p)
{
m_s = p;
CHECK ( !m_s.empty(), () );
}
template <class T> void Set(T const & s)
{
m_s = strings::to_string(s);
CHECK ( !m_s.empty(), () );
}
inline void Clear() { m_s.clear(); }
inline bool IsEmpty() const { return m_s.empty(); }
inline 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 <class 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 <class 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, 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 string DebugPrint(StringNumericOptimal const & s)
{
return s.Get();
}
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