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312 lines
10 KiB
312 lines
10 KiB
/* /////////////////////////////////////////////////////////////////////////
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* File: pantheios/inserters/real.hpp
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*
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* Purpose: String inserters for fundamental types
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*
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* Created: 21st June 2005
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* Updated: 14th February 2010
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*
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* Home: http://www.pantheios.org/
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*
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* Copyright (c) 2005-2010, Matthew Wilson and Synesis Software
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* Copyright (c) 1999-2005, Synesis Software and Matthew Wilson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - Neither the name(s) of Matthew Wilson and Synesis Software nor the
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* names of any contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* ////////////////////////////////////////////////////////////////////// */
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/** \file pantheios/inserters/real.hpp
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*
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* [C++ only] Definition of the pantheios::real string inserter for
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* for floating-point built-in types.
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*/
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#ifndef PANTHEIOS_INCL_PANTHEIOS_INSERTERS_HPP_REAL
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#define PANTHEIOS_INCL_PANTHEIOS_INSERTERS_HPP_REAL
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/* /////////////////////////////////////////////////////////////////////////
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* Version information
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*/
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#ifndef PANTHEIOS_DOCUMENTATION_SKIP_SECTION
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# define PANTHEIOS_VER_PANTHEIOS_INSERTERS_HPP_REAL_MAJOR 2
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# define PANTHEIOS_VER_PANTHEIOS_INSERTERS_HPP_REAL_MINOR 3
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# define PANTHEIOS_VER_PANTHEIOS_INSERTERS_HPP_REAL_REVISION 4
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# define PANTHEIOS_VER_PANTHEIOS_INSERTERS_HPP_REAL_EDIT 26
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#endif /* !PANTHEIOS_DOCUMENTATION_SKIP_SECTION */
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/* /////////////////////////////////////////////////////////////////////////
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* Includes
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*/
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#ifndef PANTHEIOS_INCL_PANTHEIOS_H_PANTHEIOS
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# include <pantheios/pantheios.h>
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#endif /* !PANTHEIOS_INCL_PANTHEIOS_H_PANTHEIOS */
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#ifndef PANTHEIOS_INCL_PANTHEIOS_INSERTERS_HPP_FMT
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# include <pantheios/inserters/fmt.hpp>
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#endif /* !PANTHEIOS_INCL_PANTHEIOS_INSERTERS_HPP_FMT */
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#ifndef STLSOFT_INCL_STLSOFT_SHIMS_ACCESS_STRING_H_FWD
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# include <stlsoft/shims/access/string/fwd.h>
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#endif /* !STLSOFT_INCL_STLSOFT_SHIMS_ACCESS_STRING_H_FWD */
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/* /////////////////////////////////////////////////////////////////////////
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* Namespace
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*/
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#if !defined(PANTHEIOS_NO_NAMESPACE)
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namespace pantheios
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{
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#endif /* !PANTHEIOS_NO_NAMESPACE */
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/* /////////////////////////////////////////////////////////////////////////
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* Inserter classes
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*/
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/** Class for inserting floating-point types into Pantheios diagnostic
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* logging statements.
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*
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* \ingroup group__application_layer_interface__inserters
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*
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* This class converts a floating-point variable into a string, thereby enabling it to be
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* inserted into a logging statement. Consider the following statement
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*
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* \code
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double d = 123.456;
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char s[] = "abc";
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std::string str("def");
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pantheios::log(pantheios::notice, "s=", s, ", d=", pantheios::real(d), ", str=", str);
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* \endcode
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*
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* This will produce the output:
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*
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* <b>s=abc, d=123.456, str=def</b>
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*
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* \note Currently, Pantheios does not support the implicit insertion of
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* floating-point types in diagnostic logging statements, due to the various
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* ambiguities inherent in the C++ language. (See chapters 14, 15, 19, 24 of
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* <a href = "http://imperfectcplusplus.com" target="_blank">Imperfect C++</a>
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* for discussions of these issues.) It is possible that a future version of
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* the library will be able to incorporate them directly, so long as that does
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* not sacrifice Pantheios's central claim of not paying for what you don't use.
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*/
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class real
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{
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public:
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/// This type
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typedef real class_type;
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public:
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/// Construct from a float value
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///
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/// \param value The value to be inserted
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/// \param widthAndFormat Not currently used
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explicit real(float value, int widthAndFormat = 0);
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/// Construct from a double value
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///
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/// \param value The value to be inserted
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/// \param widthAndFormat Not currently used
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explicit real(double value, int widthAndFormat = 0);
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/// Construct from a long double value
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///
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/// \param value The value to be inserted
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/// \param widthAndFormat Not currently used
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explicit real(long double value, int widthAndFormat = 0);
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private:
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explicit real(int); // Prevents implicit conversion from an integer
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public:
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/// A possibly non-nul-terminated non-null pointer to the c-style string representation of the floating-point number
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pan_char_t const* data() const;
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/// A nul-terminated non-null pointer to the c-style string representation of the floating-point number
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pan_char_t const* c_str() const;
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/// The length of the c-style string representation of the floating-point number
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size_t length() const;
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private:
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void construct_() const;
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void construct_();
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private:
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enum RealSize
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{
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typeIsFloat = -1
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, typeIsDouble = -2
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, typeIsLongDouble = -3
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};
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union u
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{
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float fValue;
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double dValue;
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long double ldValue;
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};
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u m_value; // The value, copied for lazy conversion
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size_t m_len; // Length, and marker for type: 1 == float; 2 == double; 3 == long double
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pan_char_t m_sz[256]; // Marker for converted, if m_sz[0] == '\0'
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const int m_widthAndFormat;
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private:
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#if !defined(STLSOFT_COMPILER_IS_GCC)
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real(class_type const&);
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#endif /* compiler */
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class_type& operator =(class_type const&);
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};
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/* /////////////////////////////////////////////////////////////////////////
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* String Access Shims
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*/
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#ifndef PANTHEIOS_DOCUMENTATION_SKIP_SECTION
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# if !defined(PANTHEIOS_NO_NAMESPACE)
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namespace shims
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{
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# endif /* !PANTHEIOS_NO_NAMESPACE */
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/** \overload c_str_data_a(real const&) */
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# ifdef PANTHEIOS_USE_WIDE_STRINGS
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inline wchar_t const* c_str_data_w(real const& r)
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# else /* ? PANTHEIOS_USE_WIDE_STRINGS */
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inline char const* c_str_data_a(real const& r)
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# endif /* PANTHEIOS_USE_WIDE_STRINGS */
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{
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return r.data();
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}
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/** \overload c_str_data(real const&) */
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inline pan_char_t const* c_str_data(real const& r)
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{
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return r.data();
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}
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/** \overload c_str_len_a(real const&) */
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# ifdef PANTHEIOS_USE_WIDE_STRINGS
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inline size_t c_str_len_w(real const& r)
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# else /* ? PANTHEIOS_USE_WIDE_STRINGS */
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inline size_t c_str_len_a(real const& r)
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# endif /* PANTHEIOS_USE_WIDE_STRINGS */
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{
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return r.length();
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}
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/** \overload c_str_len(real const&) */
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inline size_t c_str_len(real const& r)
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{
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return r.length();
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}
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/** \overload c_str_ptr_a(real const&) */
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# ifdef PANTHEIOS_USE_WIDE_STRINGS
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inline wchar_t const* c_str_ptr_w(real const& r)
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# else /* ? PANTHEIOS_USE_WIDE_STRINGS */
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inline char const* c_str_ptr_a(real const& r)
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# endif /* PANTHEIOS_USE_WIDE_STRINGS */
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{
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return r.c_str();
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}
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/** \overload c_str_ptr(real const&) */
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inline pan_char_t const* c_str_ptr(real const& r)
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{
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return r.c_str();
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}
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# if !defined(PANTHEIOS_NO_NAMESPACE)
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} /* namespace shims */
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# if defined(STLSOFT_COMPILER_IS_GCC)
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/* GCC does not seem to correctly handle the phases of
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* processing of C++ templates, so we need to 'use' the
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* shims into the same namespace as the inserter class
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* in order that ADL can suffice instead.
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*/
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# ifdef PANTHEIOS_USE_WIDE_STRINGS
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using ::pantheios::shims::c_str_data_w;
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using ::pantheios::shims::c_str_len_w;
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using ::pantheios::shims::c_str_ptr_w;
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# else /* ? PANTHEIOS_USE_WIDE_STRINGS */
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using ::pantheios::shims::c_str_data_a;
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using ::pantheios::shims::c_str_len_a;
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using ::pantheios::shims::c_str_ptr_a;
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# endif /* PANTHEIOS_USE_WIDE_STRINGS */
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using ::pantheios::shims::c_str_data;
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using ::pantheios::shims::c_str_len;
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using ::pantheios::shims::c_str_ptr;
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# endif /* compiler */
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# endif /* !PANTHEIOS_NO_NAMESPACE */
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#endif /* !PANTHEIOS_DOCUMENTATION_SKIP_SECTION */
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/* /////////////////////////////////////////////////////////////////////////
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* Namespace
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*/
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#if !defined(PANTHEIOS_NO_NAMESPACE)
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} /* namespace pantheios */
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namespace stlsoft
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{
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// 'Export' the string access shims into the STLSoft namespace
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//
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// c_str_ptr(_a) is not necessary for version 1.0 of Pantheios, but it's
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// defined and exported in order to allow for the case where someone
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// may find a legitimate use for the conversion classes additional to
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// the type-tunneling of the Pantheios API.
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# ifdef PANTHEIOS_USE_WIDE_STRINGS
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using ::pantheios::shims::c_str_data_w;
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using ::pantheios::shims::c_str_len_w;
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using ::pantheios::shims::c_str_ptr_w;
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# else /* ? PANTHEIOS_USE_WIDE_STRINGS */
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using ::pantheios::shims::c_str_data_a;
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using ::pantheios::shims::c_str_len_a;
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using ::pantheios::shims::c_str_ptr_a;
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# endif /* PANTHEIOS_USE_WIDE_STRINGS */
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using ::pantheios::shims::c_str_data;
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using ::pantheios::shims::c_str_len;
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using ::pantheios::shims::c_str_ptr;
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}
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#endif /* !PANTHEIOS_NO_NAMESPACE */
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/* /////////////////////////////////////////////////////////////////////////
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* Inclusion
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*/
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#ifdef STLSOFT_PPF_pragma_once_SUPPORT
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# pragma once
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#endif /* STLSOFT_PPF_pragma_once_SUPPORT */
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/* ////////////////////////////////////////////////////////////////////// */
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#endif /* !PANTHEIOS_INCL_PANTHEIOS_INSERTERS_HPP_REAL */
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/* ///////////////////////////// end of file //////////////////////////// */
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