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325 lines
11 KiB
325 lines
11 KiB
/* /////////////////////////////////////////////////////////////////////////
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* File: pantheios/inserters/m2w.hpp
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*
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* Purpose: Inserter class for incorporating multibyte strings into a
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* wide string statement.
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*
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* Created: 22nd November 2010
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* Updated: 22nd November 2010
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*
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* Home: http://www.pantheios.org/
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*
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* Copyright (c) 2010, Matthew Wilson and Synesis Software
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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/m2w.hpp
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*
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* [C++ only] Inserter class for incorporating multibyte strings into a wide
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* string statement.
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*/
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#ifndef PANTHEIOS_INCL_PANTHEIOS_INSERTERS_HPP_M2W
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#define PANTHEIOS_INCL_PANTHEIOS_INSERTERS_HPP_M2W
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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_M2W_MAJOR 1
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# define PANTHEIOS_VER_PANTHEIOS_INSERTERS_HPP_M2W_MINOR 0
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# define PANTHEIOS_VER_PANTHEIOS_INSERTERS_HPP_M2W_REVISION 0
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# define PANTHEIOS_VER_PANTHEIOS_INSERTERS_HPP_M2W_EDIT 1
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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_HPP_STRING
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# include <stlsoft/shims/access/string.hpp>
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#endif /* !STLSOFT_INCL_STLSOFT_SHIMS_ACCESS_HPP_STRING */
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#ifndef PANTHEIOS_USE_WIDE_STRINGS
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# include <stlsoft/string/string_view.hpp>
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#endif /* !PANTHEIOS_USE_WIDE_STRINGS */
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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 wide strings into Pantheios diagnostic logging
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* 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 m2w variable into a string, thereby enabling
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* it to be inserted into a logging statement. Consider the following
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* statement:
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*
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* \code
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char s[] = "abc";
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wchar_t ws = L"def";
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std::wstring wstr(L"ghi");
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pantheios::log(pantheios::notice, L"s=", pantheios::m2w(s), L", ws=", ws, L", wstr=", wstr);
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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, ws=def, str=ghi</b>
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*/
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#ifndef PANTHEIOS_USE_WIDE_STRINGS
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typedef stlsoft_ns_qual(string_view) m2w;
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#else /* ? !PANTHEIOS_USE_WIDE_STRINGS */
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class m2w
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{
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public: // Member Types
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/// This type
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typedef m2w class_type;
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public: // Construction
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/// Construct from a c-style string
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explicit m2w(char const* s);
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/// Construct from a pointer to a string and a given length
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m2w(char const* s, size_t len);
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/// Construct from a widestring of unknown type
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///
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/// \warning This method must only be used "inline", i.e. in a log
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/// statement. If you create a separate instance of m2w using this
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/// constructor and attempt to access its converted value - either
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/// directly, via c_str()/data(), or indirectly via inserting into a
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/// log statement - the program will have undefined behaviour.
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template <typename WS>
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explicit m2w(WS const& ws)
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{
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// If the init_() call fails to compile with an error message that
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// mentions
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// 'containing your_wide_type_relies_on_intermediate_shim_conversions_which_are_prohibited_unless_PANTHEIOS_SAFE_ALLOW_SHIM_INTERMEDIATES_is_defined'
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// then the (wide) shims for the type WS use intermediate instances
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// of conversion classes, and would cause undefined behaviour if
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// you were to use it any a non-"inline" log statement. If you are
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// sure you are using the inserter correctly, then #define the
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// preprocessor symbol PANTHEIOS_SAFE_ALLOW_SHIM_INTERMEDIATES to
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// allow it to compile.
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#ifndef PANTHEIOS_SAFE_ALLOW_SHIM_INTERMEDIATES
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int unused =
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#endif /* !PANTHEIOS_SAFE_ALLOW_SHIM_INTERMEDIATES */
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init_(::stlsoft::c_str_data_a(ws), ::stlsoft::c_str_len_a(ws));
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#ifndef PANTHEIOS_SAFE_ALLOW_SHIM_INTERMEDIATES
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STLSOFT_SUPPRESS_UNUSED(unused);
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#endif /* !PANTHEIOS_SAFE_ALLOW_SHIM_INTERMEDIATES */
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}
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/// Releases any resources allocated for the conversion
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~m2w() stlsoft_throw_0();
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private:
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#if !defined(STLSOFT_COMPILER_IS_GCC)
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m2w(class_type const&);
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#endif /* compiler */
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class_type& operator =(class_type const&);
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public: // Accessors
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/// A possibly non-nul-terminated non-null pointer to the c-style string representation of the m2w
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wchar_t const* data() const;
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/// A nul-terminated non-null pointer to the c-style string representation of the m2w
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wchar_t const* c_str() const;
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/// The length of the c-style string representation of the m2w
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size_t length() const;
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private: // Implementation
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int init_(char const* s, size_t n);
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#ifndef PANTHEIOS_SAFE_ALLOW_SHIM_INTERMEDIATES
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struct your_wide_type_relies_on_intermediate_shim_conversions_which_are_prohibited_unless_PANTHEIOS_SAFE_ALLOW_SHIM_INTERMEDIATES_is_defined;
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template <typename T0, typename T1>
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your_wide_type_relies_on_intermediate_shim_conversions_which_are_prohibited_unless_PANTHEIOS_SAFE_ALLOW_SHIM_INTERMEDIATES_is_defined init_(T0 const&, T1 const&);
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#endif /* !PANTHEIOS_SAFE_ALLOW_SHIM_INTERMEDIATES */
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void construct_() const;
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void construct_();
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static size_t sentinelLength_()
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{
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return ~size_t(0);
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}
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private: // Member Variables
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// We can't use auto_buffer because GCC is a total dullard, "helpfully"
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// informing us that it can't generate a copy-constructor when we're
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// telling *it* that we're proscribing that very thing.
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//
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// So, we're just going to have to manage our own memory, and use up
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// two more hours that could be more profitably spent on something else
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char const* m_source;
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size_t m_sourceLen;
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wchar_t* m_result;
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size_t m_length;
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};
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#endif /* !PANTHEIOS_USE_WIDE_STRINGS */
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/* /////////////////////////////////////////////////////////////////////////
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* String Access Shims
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*/
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#ifdef PANTHEIOS_USE_WIDE_STRINGS
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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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# ifndef PANTHEIOS_DOCUMENTATION_SKIP_SECTION
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/** \overload c_str_data_w(m2w const&) */
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inline wchar_t const* c_str_data_w(m2w const& r)
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{
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return r.data();
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}
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/** \overload c_str_data(m2w const&) */
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inline pan_char_t const* c_str_data(m2w 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_w(m2w const&) */
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inline size_t c_str_len_w(m2w const& r)
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{
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return r.length();
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}
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/** \overload c_str_len(m2w const&) */
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inline size_t c_str_len(m2w 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_w(m2w const&) */
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inline wchar_t const* c_str_ptr_w(m2w const& r)
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{
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return r.c_str();
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}
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/** \overload c_str_ptr(m2w const&) */
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inline pan_char_t const* c_str_ptr(m2w 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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using ::pantheios::shims::c_str_data_w;
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using ::pantheios::shims::c_str_data;
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using ::pantheios::shims::c_str_len_w;
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using ::pantheios::shims::c_str_len;
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using ::pantheios::shims::c_str_ptr_w;
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using ::pantheios::shims::c_str_ptr;
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# endif /* compiler */
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# endif /* !PANTHEIOS_DOCUMENTATION_SKIP_SECTION */
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# endif /* !PANTHEIOS_NO_NAMESPACE */
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#endif /* PANTHEIOS_USE_WIDE_STRINGS */
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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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# ifdef PANTHEIOS_USE_WIDE_STRINGS
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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(_w) 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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using ::pantheios::shims::c_str_data_w;
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using ::pantheios::shims::c_str_data;
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using ::pantheios::shims::c_str_len_w;
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using ::pantheios::shims::c_str_len;
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using ::pantheios::shims::c_str_ptr_w;
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using ::pantheios::shims::c_str_ptr;
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}
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# endif /* PANTHEIOS_USE_WIDE_STRINGS */
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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_M2W */
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/* ///////////////////////////// end of file //////////////////////////// */
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