mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-30 09:07:28 +03:00
90 lines
3.6 KiB
C++
90 lines
3.6 KiB
C++
|
// Copyright (c) 2009-2016 Vladimir Batov.
|
||
|
|
// Use, modification and distribution are subject to the Boost Software License,
|
||
|
|
// Version 1.0. See http://www.boost.org/LICENSE_1_0.txt.
|
||
|
|
|
||
|
|
#ifndef BOOST_CONVERT_PRINTF_HPP
|
||
|
|
#define BOOST_CONVERT_PRINTF_HPP
|
||
|
|
|
||
|
|
#include <boost/convert/base.hpp>
|
||
|
|
#include <boost/make_default.hpp>
|
||
|
|
#include <boost/mpl/vector.hpp>
|
||
|
|
#include <boost/mpl/find.hpp>
|
||
|
|
#include <boost/range/as_literal.hpp>
|
||
|
|
#include <string>
|
||
|
|
#include <cstdio>
|
||
|
|
|
||
|
|
namespace boost { namespace cnv
|
||
|
|
{
|
||
|
|
struct printf;
|
||
|
|
}}
|
||
|
|
|
||
|
|
struct boost::cnv::printf : public boost::cnv::cnvbase<boost::cnv::printf>
|
||
|
|
{
|
||
|
|
typedef boost::cnv::printf this_type;
|
||
|
|
typedef boost::cnv::cnvbase<this_type> base_type;
|
||
|
|
|
||
|
|
using base_type::operator();
|
||
|
|
|
||
|
|
template<typename in_type>
|
||
|
|
cnv::range<char*>
|
||
|
|
to_str(in_type value_in, char* buf) const
|
||
|
|
{
|
||
|
|
char const* fmt = pformat(pos<in_type>());
|
||
|
|
int const num_chars = snprintf(buf, bufsize_, fmt, precision_, value_in);
|
||
|
|
bool const success = num_chars < bufsize_;
|
||
|
|
|
||
|
|
return cnv::range<char*>(buf, success ? (buf + num_chars) : buf);
|
||
|
|
}
|
||
|
|
template<typename string_type, typename out_type>
|
||
|
|
void
|
||
|
|
str_to(cnv::range<string_type> range, optional<out_type>& result_out) const
|
||
|
|
{
|
||
|
|
out_type result = boost::make_default<out_type>();
|
||
|
|
int const num_read = sscanf(&*range.begin(), format(pos<out_type>()), &result);
|
||
|
|
|
||
|
|
if (num_read == 1)
|
||
|
|
result_out = result;
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
|
||
|
|
template<typename Type> int pos() const
|
||
|
|
{
|
||
|
|
typedef boost::mpl::vector<double, float,
|
||
|
|
int, unsigned int,
|
||
|
|
short int, unsigned short int,
|
||
|
|
long int, unsigned long int
|
||
|
|
> managed_types;
|
||
|
|
|
||
|
|
typedef typename boost::mpl::find<managed_types, Type>::type type_iterator;
|
||
|
|
typedef typename type_iterator::pos type_pos;
|
||
|
|
|
||
|
|
return type_pos::value;
|
||
|
|
}
|
||
|
|
|
||
|
|
char const* pformat(int pos) const
|
||
|
|
{
|
||
|
|
static char const* d_format[] = { "%.*f", "%.*f", "%.*d", "%.*u", "%.*hd", "%.*hu", "%.*ld", "%.*lu" }; // Must match managed_types
|
||
|
|
static char const* x_format[] = { "%.*f", "%.*f", "%.*x", "%.*x", "%.*hx", "%.*hx", "%.*lx", "%.*lx" }; // Must match managed_types
|
||
|
|
static char const* o_format[] = { "%.*f", "%.*f", "%.*o", "%.*o", "%.*ho", "%.*ho", "%.*lo", "%.*lo" }; // Must match managed_types
|
||
|
|
char const* format = base_ == 10 ? d_format[pos]
|
||
|
|
: base_ == 16 ? x_format[pos]
|
||
|
|
: base_ == 8 ? o_format[pos]
|
||
|
|
: (BOOST_ASSERT(0), (char const*) 0);
|
||
|
|
return format;
|
||
|
|
}
|
||
|
|
char const* format(int pos) const
|
||
|
|
{
|
||
|
|
static char const* d_format[] = { "%f", "%f", "%d", "%u", "%hd", "%hu", "%ld", "%lu" }; // Must match managed_types
|
||
|
|
static char const* x_format[] = { "%f", "%f", "%x", "%x", "%hx", "%hx", "%lx", "%lx" }; // Must match managed_types
|
||
|
|
static char const* o_format[] = { "%f", "%f", "%o", "%o", "%ho", "%ho", "%lo", "%lo" }; // Must match managed_types
|
||
|
|
char const* format = base_ == 10 ? d_format[pos]
|
||
|
|
: base_ == 16 ? x_format[pos]
|
||
|
|
: base_ == 8 ? o_format[pos]
|
||
|
|
: (BOOST_ASSERT(0), (char const*) 0);
|
||
|
|
return format;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif // BOOST_CONVERT_PRINTF_HPP
|