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wxWidgets/include/wx/strvararg.h
Václav Slavík 359bd4d1a2 allow passing wx[W]CharBuffer to wx vararg templates 
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45099 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2007-03-28 18:03:26 +00:00

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///////////////////////////////////////////////////////////////////////////////
// Name: wx/strvararg.h
// Purpose: macros for implementing type-safe vararg passing of strings
// Author: Vaclav Slavik
// Created: 2007-02-19
// RCS-ID: $Id$
// Copyright: (c) 2007 REA Elektronik GmbH
// Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
#ifndef _WX_STRVARARG_H_
#define _WX_STRVARARG_H_
#include "wx/platform.h"
#if wxONLY_WATCOM_EARLIER_THAN(1,4)
#error "OpenWatcom version >= 1.4 is required to compile this code"
#endif
#include "wx/chartype.h"
class WXDLLIMPEXP_BASE wxCStrData;
class WXDLLIMPEXP_BASE wxString;
class WXDLLIMPEXP_BASE wxCharBuffer;
class WXDLLIMPEXP_BASE wxWCharBuffer;
// ----------------------------------------------------------------------------
// WX_DEFINE_VARARG_FUNC* macros
// ----------------------------------------------------------------------------
// This macro is used to implement type-safe wrappers for variadic functions
// that accept strings as arguments. This makes it possible to pass char*,
// wchar_t* or even wxString (as opposed to having to use wxString::c_str())
// to e.g. wxPrintf().
//
// This is done by defining a set of N template function taking 1..N arguments
// (currently, N is set to 30 in this header). These functions are just thin
// wrappers around another variadic function (@a impl) and the only thing
// the wrapper does is that it normalizes the arguments passed in so that
// they are of the type expected by variadic functions taking string
// arguments, i.e., char* or wchar_t*, depending on the build:
// * char* in the current locale's charset in ANSI build
// * whchar_t* in the Unicode build
//
// Parameters:
// rettype Functions' return type.
// name Name of the function.
// impl Name of the variadic function that implements 'name'.
#define WX_DEFINE_VARARG_FUNC(rettype, name, impl) \
_WX_VARARG_ITER(_WX_VARARG_MAX_ARGS, \
_WX_VARARG_DEFINE_FUNC, \
rettype, name, impl)
// Like WX_DEFINE_VARARG_FUNC, but for variadic functions that don't return
// a value.
#define WX_DEFINE_VARARG_FUNC_VOID(name, impl) \
_WX_VARARG_ITER(_WX_VARARG_MAX_ARGS, \
_WX_VARARG_DEFINE_FUNC_VOID, \
void, name, impl)
// Like WX_DEFINE_VARARG_FUNC_VOID, but instead of wrapping an implementation
// function, does nothing in defined functions' bodies.
//
// Used to implement wxLogXXX functions if wxUSE_LOG=0.
#define WX_DEFINE_VARARG_FUNC_NOP(name) \
_WX_VARARG_ITER(_WX_VARARG_MAX_ARGS, \
_WX_VARARG_DEFINE_FUNC_NOP, \
void, name, dummy)
// ----------------------------------------------------------------------------
// implementation
// ----------------------------------------------------------------------------
// Converts an argument passed to wxPrint etc. into standard form expected,
// by wxXXX functions, e.g. all strings (wxString, char*, wchar_t*) are
// converted into wchar_t* or char* depending on the build.
template<typename T>
struct wxArgNormalizer
{
wxArgNormalizer(const T& value) : m_value(value) {}
// Returns the value in a form that can be safely passed to real vararg
// functions. In case of strings, this is char* in ANSI build and wchar_t*
// in Unicode build.
const T& get() const { return m_value; }
const T& m_value;
};
// special cases for converting strings:
template<>
struct WXDLLIMPEXP_BASE wxArgNormalizer<const wxCStrData&>
{
wxArgNormalizer(const wxCStrData& value) : m_value(value) {}
const wxStringCharType *get() const;
const wxCStrData& m_value;
};
template<>
struct wxArgNormalizer<wxCStrData> : public wxArgNormalizer<const wxCStrData&>
{
wxArgNormalizer(const wxCStrData& value)
: wxArgNormalizer<const wxCStrData&>(value) {}
};
template<>
struct WXDLLIMPEXP_BASE wxArgNormalizer<const wxString&>
{
wxArgNormalizer(const wxString& value) : m_value(value) {}
const wxStringCharType *get() const;
const wxString& m_value;
};
template<>
struct wxArgNormalizer<wxString> : public wxArgNormalizer<const wxString&>
{
wxArgNormalizer(const wxString& value)
: wxArgNormalizer<const wxString&>(value) {}
};
#if wxUSE_UNICODE_WCHAR
template<>
struct WXDLLIMPEXP_BASE wxArgNormalizer<const char*>
{
wxArgNormalizer(const char *value);
~wxArgNormalizer();
const wchar_t *get() const;
wxWCharBuffer *m_value;
};
template<>
struct wxArgNormalizer<char*> : public wxArgNormalizer<const char*>
{
wxArgNormalizer(char *value)
: wxArgNormalizer<const char*>(value) {}
};
#elif wxUSE_WCHAR_T // !wxUSE_UNICODE_WCHAR && wxUSE_WCHAR_T
template<>
struct WXDLLIMPEXP_BASE wxArgNormalizer<const wchar_t*>
{
wxArgNormalizer(const wchar_t *value);
~wxArgNormalizer();
const char *get() const;
wxCharBuffer *m_value;
};
template<>
struct wxArgNormalizer<wchar_t*> : public wxArgNormalizer<const wchar_t*>
{
wxArgNormalizer(wchar_t *value)
: wxArgNormalizer<const wchar_t*>(value) {}
};
#endif // wxUSE_UNICODE_WCHAR / !wxUSE_UNICODE_WCHAR && wxUSE_WCHAR_T
// versions for passing wx[W]CharBuffer:
template<>
struct WXDLLIMPEXP_BASE wxArgNormalizer<wxCharBuffer>
: public wxArgNormalizer<const char*>
{
wxArgNormalizer(const wxCharBuffer& buf);
};
template<>
struct WXDLLIMPEXP_BASE wxArgNormalizer<wxWCharBuffer>
: public wxArgNormalizer<const wchar_t*>
{
wxArgNormalizer(const wxWCharBuffer& buf);
};
// NB: The vararg emulation code is limited to 30 arguments at the moment.
// If you need more, you need to
// 1) increase the value of _WX_VARARG_MAX_ARGS
// 2) add _WX_VARARG_JOIN_* and _WX_VARARG_ITER_* up to the new
// _WX_VARARG_MAX_ARGS value to the lists below
#define _WX_VARARG_MAX_ARGS 30
#define _WX_VARARG_JOIN_1(m) m(1)
#define _WX_VARARG_JOIN_2(m) _WX_VARARG_JOIN_1(m), m(2)
#define _WX_VARARG_JOIN_3(m) _WX_VARARG_JOIN_2(m), m(3)
#define _WX_VARARG_JOIN_4(m) _WX_VARARG_JOIN_3(m), m(4)
#define _WX_VARARG_JOIN_5(m) _WX_VARARG_JOIN_4(m), m(5)
#define _WX_VARARG_JOIN_6(m) _WX_VARARG_JOIN_5(m), m(6)
#define _WX_VARARG_JOIN_7(m) _WX_VARARG_JOIN_6(m), m(7)
#define _WX_VARARG_JOIN_8(m) _WX_VARARG_JOIN_7(m), m(8)
#define _WX_VARARG_JOIN_9(m) _WX_VARARG_JOIN_8(m), m(9)
#define _WX_VARARG_JOIN_10(m) _WX_VARARG_JOIN_9(m), m(10)
#define _WX_VARARG_JOIN_11(m) _WX_VARARG_JOIN_10(m), m(11)
#define _WX_VARARG_JOIN_12(m) _WX_VARARG_JOIN_11(m), m(12)
#define _WX_VARARG_JOIN_13(m) _WX_VARARG_JOIN_12(m), m(13)
#define _WX_VARARG_JOIN_14(m) _WX_VARARG_JOIN_13(m), m(14)
#define _WX_VARARG_JOIN_15(m) _WX_VARARG_JOIN_14(m), m(15)
#define _WX_VARARG_JOIN_16(m) _WX_VARARG_JOIN_15(m), m(16)
#define _WX_VARARG_JOIN_17(m) _WX_VARARG_JOIN_16(m), m(17)
#define _WX_VARARG_JOIN_18(m) _WX_VARARG_JOIN_17(m), m(18)
#define _WX_VARARG_JOIN_19(m) _WX_VARARG_JOIN_18(m), m(19)
#define _WX_VARARG_JOIN_20(m) _WX_VARARG_JOIN_19(m), m(20)
#define _WX_VARARG_JOIN_21(m) _WX_VARARG_JOIN_20(m), m(21)
#define _WX_VARARG_JOIN_22(m) _WX_VARARG_JOIN_21(m), m(22)
#define _WX_VARARG_JOIN_23(m) _WX_VARARG_JOIN_22(m), m(23)
#define _WX_VARARG_JOIN_24(m) _WX_VARARG_JOIN_23(m), m(24)
#define _WX_VARARG_JOIN_25(m) _WX_VARARG_JOIN_24(m), m(25)
#define _WX_VARARG_JOIN_26(m) _WX_VARARG_JOIN_25(m), m(26)
#define _WX_VARARG_JOIN_27(m) _WX_VARARG_JOIN_26(m), m(27)
#define _WX_VARARG_JOIN_28(m) _WX_VARARG_JOIN_27(m), m(28)
#define _WX_VARARG_JOIN_29(m) _WX_VARARG_JOIN_28(m), m(29)
#define _WX_VARARG_JOIN_30(m) _WX_VARARG_JOIN_29(m), m(30)
#define _WX_VARARG_ITER_1(m,a,b,c) m(1,a,b,c)
#define _WX_VARARG_ITER_2(m,a,b,c) _WX_VARARG_ITER_1(m,a,b,c) m(2,a,b,c)
#define _WX_VARARG_ITER_3(m,a,b,c) _WX_VARARG_ITER_2(m,a,b,c) m(3,a,b,c)
#define _WX_VARARG_ITER_4(m,a,b,c) _WX_VARARG_ITER_3(m,a,b,c) m(4,a,b,c)
#define _WX_VARARG_ITER_5(m,a,b,c) _WX_VARARG_ITER_4(m,a,b,c) m(5,a,b,c)
#define _WX_VARARG_ITER_6(m,a,b,c) _WX_VARARG_ITER_5(m,a,b,c) m(6,a,b,c)
#define _WX_VARARG_ITER_7(m,a,b,c) _WX_VARARG_ITER_6(m,a,b,c) m(7,a,b,c)
#define _WX_VARARG_ITER_8(m,a,b,c) _WX_VARARG_ITER_7(m,a,b,c) m(8,a,b,c)
#define _WX_VARARG_ITER_9(m,a,b,c) _WX_VARARG_ITER_8(m,a,b,c) m(9,a,b,c)
#define _WX_VARARG_ITER_10(m,a,b,c) _WX_VARARG_ITER_9(m,a,b,c) m(10,a,b,c)
#define _WX_VARARG_ITER_11(m,a,b,c) _WX_VARARG_ITER_10(m,a,b,c) m(11,a,b,c)
#define _WX_VARARG_ITER_12(m,a,b,c) _WX_VARARG_ITER_11(m,a,b,c) m(12,a,b,c)
#define _WX_VARARG_ITER_13(m,a,b,c) _WX_VARARG_ITER_12(m,a,b,c) m(13,a,b,c)
#define _WX_VARARG_ITER_14(m,a,b,c) _WX_VARARG_ITER_13(m,a,b,c) m(14,a,b,c)
#define _WX_VARARG_ITER_15(m,a,b,c) _WX_VARARG_ITER_14(m,a,b,c) m(15,a,b,c)
#define _WX_VARARG_ITER_16(m,a,b,c) _WX_VARARG_ITER_15(m,a,b,c) m(16,a,b,c)
#define _WX_VARARG_ITER_17(m,a,b,c) _WX_VARARG_ITER_16(m,a,b,c) m(17,a,b,c)
#define _WX_VARARG_ITER_18(m,a,b,c) _WX_VARARG_ITER_17(m,a,b,c) m(18,a,b,c)
#define _WX_VARARG_ITER_19(m,a,b,c) _WX_VARARG_ITER_18(m,a,b,c) m(19,a,b,c)
#define _WX_VARARG_ITER_20(m,a,b,c) _WX_VARARG_ITER_19(m,a,b,c) m(20,a,b,c)
#define _WX_VARARG_ITER_21(m,a,b,c) _WX_VARARG_ITER_20(m,a,b,c) m(21,a,b,c)
#define _WX_VARARG_ITER_22(m,a,b,c) _WX_VARARG_ITER_21(m,a,b,c) m(22,a,b,c)
#define _WX_VARARG_ITER_23(m,a,b,c) _WX_VARARG_ITER_22(m,a,b,c) m(23,a,b,c)
#define _WX_VARARG_ITER_24(m,a,b,c) _WX_VARARG_ITER_23(m,a,b,c) m(24,a,b,c)
#define _WX_VARARG_ITER_25(m,a,b,c) _WX_VARARG_ITER_24(m,a,b,c) m(25,a,b,c)
#define _WX_VARARG_ITER_26(m,a,b,c) _WX_VARARG_ITER_25(m,a,b,c) m(26,a,b,c)
#define _WX_VARARG_ITER_27(m,a,b,c) _WX_VARARG_ITER_26(m,a,b,c) m(27,a,b,c)
#define _WX_VARARG_ITER_28(m,a,b,c) _WX_VARARG_ITER_27(m,a,b,c) m(28,a,b,c)
#define _WX_VARARG_ITER_29(m,a,b,c) _WX_VARARG_ITER_28(m,a,b,c) m(29,a,b,c)
#define _WX_VARARG_ITER_30(m,a,b,c) _WX_VARARG_ITER_29(m,a,b,c) m(30,a,b,c)
// This macro calls another macro 'm' passed as second argument 'N' times,
// with its only argument set to 1..N, and concatenates the results using
// comma as separator.
//
// An example:
// #define foo(i) x##i
// // this expands to "x1,x2,x3,x4"
// _WX_VARARG_JOIN(4, foo)
//
//
// N must not be greater than _WX_VARARG_MAX_ARGS (=30).
#define _WX_VARARG_JOIN(N, m) _WX_VARARG_JOIN_IMPL(N, m)
#define _WX_VARARG_JOIN_IMPL(N, m) _WX_VARARG_JOIN_##N(m)
// This macro calls another macro 'm' passed as second argument 'N' times, with
// its first argument set to 1..N and the remaining arguments set to 'a', 'b'
// and 'c'. The results are separated with whitespace in the expansion.
//
// An example:
// // this macro expands to:
// // foo(1,a,b,c)
// // foo(2,a,b,c)
// // foo(3,a,b,c)
// _WX_VARARG_ITER(3, foo, a, b, c)
//
// N must not be greater than _WX_VARARG_MAX_ARGS (=30).
#define _WX_VARARG_ITER(N, m,a,b,c) _WX_VARARG_ITER_IMPL(N, m, a, b, c)
#define _WX_VARARG_ITER_IMPL(N, m,a,b,c) _WX_VARARG_ITER_##N(m, a, b, c)
// Generates code snippet for i-th argument in vararg function's prototype.
#define _WX_VARARG_ARG(i) T##i a##i
// Like _WX_VARARG_ARG_UNUSED, but outputs argument's type with WXUNUSED.
#define _WX_VARARG_ARG_UNUSED(i) T##i WXUNUSED(a##i)
// Generates code snippet for i-th type in vararg function's template<...>.
#define _WX_VARARG_TEMPL(i) typename T##i
// Generates code snippet for passing i-th argument of vararg function
// wrapper to its implementation, normalizing it in the process
#define _WX_VARARG_PASS(i) wxArgNormalizer<T##i>(a##i).get()
// Macro to be used with _WX_VARARG_ITER in the implementation of
// WX_DEFINE_VARARG_FUNC (see its documentation for the meaning of arguments)
#define _WX_VARARG_DEFINE_FUNC(N, rettype, name, impl) \
template<_WX_VARARG_JOIN(N, _WX_VARARG_TEMPL)> \
rettype name(_WX_VARARG_JOIN(N, _WX_VARARG_ARG)) \
{ \
return impl(_WX_VARARG_JOIN(N, _WX_VARARG_PASS)); \
}
// Macro to be used with _WX_VARARG_ITER in the implementation of
// WX_DEFINE_VARARG_FUNC_VOID (see its documentation for the meaning of
// arguments; rettype is ignored and is used only to satisfy _WX_VARARG_ITER's
// requirements).
#define _WX_VARARG_DEFINE_FUNC_VOID(N, rettype, name, impl) \
template<_WX_VARARG_JOIN(N, _WX_VARARG_TEMPL)> \
void name(_WX_VARARG_JOIN(N, _WX_VARARG_ARG)) \
{ \
impl(_WX_VARARG_JOIN(N, _WX_VARARG_PASS)); \
}
// Macro to be used with _WX_VARARG_ITER in the implementation of
// WX_DEFINE_VARARG_FUNC_NOP, i.e. empty stub for a disabled vararg function.
// The rettype and impl arguments are ignored.
#define _WX_VARARG_DEFINE_FUNC_NOP(N, rettype, name, impl) \
template<_WX_VARARG_JOIN(N, _WX_VARARG_TEMPL)> \
void name(_WX_VARARG_JOIN(N, _WX_VARARG_ARG_UNUSED)) {}
#endif // _WX_STRVARARG_H_
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