第16回 CMake編まとめ

[cpp title=”sample.cpp”] #include <iostream>
#include "xprintf.h"

enum class Enum { Idle, Test };

class Ratio
{
int mFraction;
int mDenominator;
public:
Ratio(int iFraction, int iDenominator) :
mFraction(iFraction), mDenominator(iDenominator)
{ }
friend std::ostream& operator<<(std::ostream& iOStream, Ratio const& iRatio)
{
iOStream << iRatio.mFraction << "/" << iRatio.mDenominator;
return iOStream;
}
};

int main()
{
std::cout << xprintf("%10s = %10.2f\n", "double", 2345.678);

Enum aEnum = Enum::Test;
std::cout << xprintf("%10s = %10d\n", "aEnum", aEnum);

Ratio aRatio(16, 9);
std::cout << xprintf("%10s = %10s\n", "aRatio", aRatio);

std::string aString="test";
std::cout << xprintf("%10s = %10s\n", "aString", aString);
}
[/cpp] [cpp title=”xprintf.h”] #include <type_traits>
#include <sstream>

namespace boost
{
template<class charT, class Traits, class Alloc> class basic_format;
typedef basic_format<char, std::char_traits<char>, std::allocator<char>> format;
}
namespace internal
{
std::string getString(boost::format& iFormat);
template<typename tType>
boost::format& output(boost::format& iFormat, tType iParam);
boost::format& makeFormat(std::string const& iFormat);

// ユーザ定義型対応
template<typename tType, typename tEnable=void>
struct Out
{
static boost::format& put(boost::format& iFormat, tType& iParam)
{
std::stringstream ss;
ss << iParam;
return output(iFormat, ss.str().c_str());
}
};
template<typename tType>
struct Out<tType, typename std::enable_if<std::is_arithmetic<tType>::value>::type>
{
static boost::format& put(boost::format& iFormat, tType& iParam)
{
return output(iFormat, iParam);
}
};
// scoped enum型にも対応
template<typename tType>
struct Out<tType, typename std::enable_if<std::is_enum<tType>::value>::type>
{
static boost::format& put(boost::format& iFormat, tType& iParam)
{
return output(iFormat, static_cast<typename std::underlying_type<tType>::type>(iParam));
}
};

inline std::string xprintf_impl(boost::format& iFormat)
{
return getString(iFormat);
}
template<typename tFirst, typename… tParams>
inline std::string xprintf_impl(boost::format& iFormat, tFirst iFirst, tParams… iParams)
{
return xprintf_impl(Out<tFirst>::put(iFormat, iFirst), iParams…);
}
}
template<typename… tParams>
inline std::string xprintf(std::string const& iFormat, tParams… iParams)
{
return internal::xprintf_impl(internal::makeFormat(iFormat), iParams…);
}
[/cpp] [cpp title=”xprintf.cpp”] #include <boost/format.hpp>
#include "xprintf.h"

namespace internal
{
std::string getString(boost::format& iFormat)
{
return iFormat.str();
}

template<typename tType>
boost::format& output(boost::format& iFormat, tType iParam)
{
return iFormat % iParam;
}

boost::format& makeFormat(std::string const& iFormat)
{
static boost::format aFormat("");
aFormat.parse(iFormat);
return aFormat;
}

// 明示的実体化
template boost::format& output(boost::format& iFormat, bool iParam);
template boost::format& output(boost::format& iFormat, char iParam);

template boost::format& output(boost::format& iFormat, signed char iParam);
template boost::format& output(boost::format& iFormat, short iParam);
template boost::format& output(boost::format& iFormat, int iParam);
template boost::format& output(boost::format& iFormat, long iParam);
template boost::format& output(boost::format& iFormat, long long iParam);

template boost::format& output(boost::format& iFormat, unsigned char iParam);
template boost::format& output(boost::format& iFormat, unsigned short iParam);
template boost::format& output(boost::format& iFormat, unsigned int iParam);
template boost::format& output(boost::format& iFormat, unsigned long long iParam);

template boost::format& output(boost::format& iFormat, float iParam);
template boost::format& output(boost::format& iFormat, double iParam);
template boost::format& output(boost::format& iFormat, long double iParam);

template boost::format& output(boost::format& iFormat, char const* iParam);
}
[/cpp]