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//
// Copyright (c) ZeroC, Inc. All rights reserved.
//
#ifndef STRING_VIEW_H
#define STRING_VIEW_H
#include <Ice/Ice.h>
//
// COMPILERFIX: G++ false positive "maybe-uninitialized" warnings when using
// string_view with Ice::optional in C++17 mode.
//
#if defined(__GNUC__) && !defined(__clang__) && ICE_CPLUSPLUS >= 201703L
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
#endif
namespace Util
{
//
// A simplified version of boost::string_ref and the new
// std::experimental::fundamentals_v1::string_view
//
class string_view
{
public:
string_view() :
_data(0),
_size(0)
{}
string_view(const string_view& sv) :
_data(sv._data),
_size(sv._size)
{}
string_view(const std::string& s) :
_data(s.data()),
_size(s.length())
{}
string_view(const char* str) :
_data(str),
_size(strlen(str))
{
}
string_view(const char* str, size_t len) :
_data(str),
_size(len)
{}
string_view& operator=(const string_view& sv)
{
_data = sv._data;
_size = sv._size;
return *this;
}
size_t size() const
{
return _size;
}
size_t length() const
{
return _size;
}
bool empty() const
{
return _size != 0;
}
const char* data() const
{
return _data;
}
void clear()
{
_data = 0;
_size = 0;
}
std::string to_string() const
{
return std::string(_data, _size);
}
int compare(string_view str) const
{
if(_size == str._size)
{
if(_data == str._data)
{
return 0;
}
else
{
return strncmp(_data, str._data, _size);
}
}
else if(_size < str._size)
{
return -1;
}
else
{
return 1;
}
}
private:
const char* _data;
size_t _size;
};
inline bool
operator==(string_view lhs, string_view rhs)
{
return lhs.compare(rhs) == 0;
}
inline bool
operator!=(string_view lhs, string_view rhs)
{
return lhs.compare(rhs) != 0;
}
}
namespace Ice
{
//
// Describes how to marshal/unmarshal a Util::string_view
// It would be the same for a string_ref or std...::string_view
//
template<>
struct StreamableTraits<Util::string_view>
{
static const StreamHelperCategory helper = StreamHelperCategoryBuiltin;
static const int minWireSize = 1;
static const bool fixedLength = false;
};
template<>
struct StreamHelper<Util::string_view, StreamHelperCategoryBuiltin>
{
template<class S> static inline void
write(S* stream, const Util::string_view& v)
{
#ifdef ICE_CPP11_MAPPING
stream->write(v.data(), v.size());
#else
//
// In C++98, for consistency with the read, we don't string-convert
//
stream->write(v.data(), v.size(), false);
#endif
}
template<class S> static inline void
read(S* stream, Util::string_view& v)
{
const char* vdata = 0;
size_t vsize = 0;
//
// In C++98, we ignore the string converter
//
stream->read(vdata, vsize);
if(vsize > 0)
{
v = Util::string_view(vdata, vsize);
}
else
{
v.clear();
}
}
};
}
#if defined(__GNUC__) && !defined(__clang__) && ICE_CPLUSPLUS >= 201703L
# pragma GCC diagnostic pop
#endif
#endif
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