include/pantheios/inserters/real.hpp

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/* /////////////////////////////////////////////////////////////////////////
 * File:        pantheios/inserters/real.hpp
 *
 * Purpose:     String inserters for fundamental types
 *
 * Created:     21st June 2005
 * Updated:     1st September 2006
 *
 * Author:      Matthew Wilson
 *
 * Home:        http://www.pantheios.org/
 *
 * Copyright:   Matthew Wilson and Synesis Software Pty Ltd, 1999-2005.
 *              Matthew Wilson, 2005-2006.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - Neither the names of Matthew Wilson and Synesis Software nor the names of
 *   any contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * ////////////////////////////////////////////////////////////////////// */


#ifndef PANTHEIOS_INCL_PANTHEIOS_INSERTERS_HPP_REAL
#define PANTHEIOS_INCL_PANTHEIOS_INSERTERS_HPP_REAL

/* /////////////////////////////////////////////////////////////////////////
 * Version information
 */

#ifndef PANTHEIOS_DOCUMENTATION_SKIP_SECTION
# define PANTHEIOS_VER_PANTHEIOS_INSERTERS_HPP_REAL_MAJOR       2
# define PANTHEIOS_VER_PANTHEIOS_INSERTERS_HPP_REAL_MINOR       0
# define PANTHEIOS_VER_PANTHEIOS_INSERTERS_HPP_REAL_REVISION    8
# define PANTHEIOS_VER_PANTHEIOS_INSERTERS_HPP_REAL_EDIT        8
#endif /* !PANTHEIOS_DOCUMENTATION_SKIP_SECTION */

/* /////////////////////////////////////////////////////////////////////////
 * Includes
 */

#include <pantheios/pantheios.hpp>
#include <pantheios/inserters/fmt.hpp>

#include <stlsoft/shims/access/string/fwd.h>

/* /////////////////////////////////////////////////////////////////////////
 * Namespace
 */

#if !defined(PANTHEIOS_NO_NAMESPACE)
namespace pantheios
{

#endif /* !PANTHEIOS_NO_NAMESPACE */

/* /////////////////////////////////////////////////////////////////////////
 * Inserter classes
 */

class real
{
public:
    typedef real    class_type;

public:
    explicit real(float value, int widthAndFormat = 0);
    explicit real(double value, int widthAndFormat = 0);
    explicit real(long double value, int widthAndFormat = 0);

private:
    explicit real(int); // Prevents implicit conversion from an integer

public:
    char const  *data() const;
    char const  *c_str() const;
    size_t      length() const;

private:
    void construct_() const;
    void construct_();

private:
    enum RealSize
    {
            typeIsFloat         =   -1
        ,   typeIsDouble        =   -2
        ,   typeIsLongDouble    =   -3
    };

    union u
    {
        float       fValue;
        double      dValue;
        long double ldValue;
    };

    u           m_value;            // The value, copied for lazy conversion
    size_t      m_len;              // Length, and marker for type: 1 == float; 2 == double; 3 == long double
    char        m_sz[256];          // Marker for converted, if m_sz[0] == '\0'
    const int   m_widthAndFormat;

private:
#if !defined(STLSOFT_COMPILER_IS_GCC)
    real(class_type const &);
#endif /* compiler */
    class_type &operator =(class_type const &);
};

/* /////////////////////////////////////////////////////////////////////////
 * String Access Shims
 */

inline char const *c_str_data_a(real const &r)
{
    return r.data();
}
inline char const *c_str_data(real const &r)
{
    return r.data();
}

inline size_t c_str_len_a(real const &r)
{
    return r.length();
}
inline size_t c_str_len(real const &r)
{
    return r.length();
}

inline char const *c_str_ptr_a(real const &r)
{
    return r.c_str();
}
inline char const *c_str_ptr(real const &r)
{
    return r.c_str();
}

/* /////////////////////////////////////////////////////////////////////////
 * Namespace
 */

#if !defined(PANTHEIOS_NO_NAMESPACE)
} /* namespace pantheios */

namespace stlsoft
{
    // 'Export' the string access shims into the STLSoft namespace
    //
    // c_str_ptr(_a) is not necessary for version 1.0 of Pantheios, but it's
    // defined and exported in order to allow for the case where someone
    // may find a legitimate use for the conversion classes additional to
    // the type-tunnelling of the Panthieos API.

    using ::pantheios::c_str_data_a;
    using ::pantheios::c_str_data;

    using ::pantheios::c_str_len;
    using ::pantheios::c_str_len_a;

    using ::pantheios::c_str_ptr_a;
    using ::pantheios::c_str_ptr;
}

#endif /* !PANTHEIOS_NO_NAMESPACE */

/* /////////////////////////////////////////////////////////////////////////
 * Inclusion
 */

#ifdef STLSOFT_CF_PRAGMA_ONCE_SUPPORT
# pragma once
#endif /* STLSOFT_CF_PRAGMA_ONCE_SUPPORT */

/* ////////////////////////////////////////////////////////////////////// */

#endif /* !PANTHEIOS_INCL_PANTHEIOS_INSERTERS_HPP_REAL */

/* ////////////////////////////////////////////////////////////////////// */

pantheios Library documentation © Matthew Wilson, 2006