kicad/include/macros.h

102 lines
3.2 KiB
C++

/**
* @file macros.h
* @brief This file contains miscellaneous helper definitions and functions.
*/
#ifndef MACROS_H
#define MACROS_H
#include <wx/wx.h>
/**
* Macro TO_UTF8
* converts a wxString to a UTF8 encoded C string for all wxWidgets build modes.
* wxstring is a wxString, not a wxT() or _(). The scope of the return value
* is very limited and volatile, but can be used with printf() style functions well.
* NOTE: Trying to convert it to a function is tricky because of the
* type of the parameter!
*/
#define TO_UTF8( wxstring ) ( (const char*) (wxstring).utf8_str() )
/**
* function FROM_UTF8
* converts a UTF8 encoded C string to a wxString for all wxWidgets build modes.
*/
static inline wxString FROM_UTF8( const char* cstring )
{
wxString line = wxString::FromUTF8( cstring );
if( line.IsEmpty() ) // happens when cstring is not a valid UTF8 sequence
line = wxConvCurrent->cMB2WC( cstring ); // try to use locale conversion
return line;
}
/**
* Function GetChars
* returns a wxChar* to the actual character data within a wxString, and is
* helpful for passing strings to wxString::Printf(wxT("%s"), GetChars(wxString) )
* <p>
* wxChar is defined to be
* <ul>
* <li> standard C style char when wxUSE_UNICODE==0 </li>
* <li> wchar_t when wxUSE_UNICODE==1 (the default). </li>
* </ul>
* i.e. it depends on how the wxWidgets library was compiled.
* ( wxUSE_UNICODE is defined in wxWidgets, inside setup.h.
* for version >= 2.9 wxUSE_UNICODE is always defined to 1 )
* There was a period
* during the development of wxWidgets 2.9 when GetData() was missing, so this
* function was used to provide insulation from that design change. It may
* no longer be needed, and is harmless. GetData() seems to be an acceptable
* alternative in all cases now.
*/
static inline const wxChar* GetChars( const wxString& s )
{
#if wxCHECK_VERSION( 2, 9, 0 )
return (const wxChar*) s.c_str();
#else
return s.GetData();
#endif
}
// This really needs a function? well, it is used *a lot* of times
template <class T> inline void NEGATE( T &x ) { x = -x; }
/// # of elements in an array
#define DIM( x ) unsigned( sizeof(x) / sizeof( (x)[0] ) ) // not size_t
/// Exchange two values
// std::swap works only with arguments of the same type (which is saner);
// here the compiler will figure out what to do (I hope to get rid of
// this soon or late)
template <class T, class T2> inline void EXCHG( T& a, T2& b )
{
T temp = a;
a = b;
b = temp;
}
/**
* Function Clamp
* limits @a value within the range @a lower <= @a value <= @a upper. It will work
* on temporary expressions, since they are evaluated only once, and it should work
* on most if not all numeric types, string types, or any type for which "operator < ()"
* is present. The arguments are accepted in this order so you can remember the
* expression as a memory aid:
* <p>
* result is: lower <= value <= upper
*/
template <typename T> inline const T& Clamp( const T& lower, const T& value, const T& upper )
{
wxASSERT( lower <= upper );
if( value < lower )
return lower;
else if( upper < value )
return upper;
return value;
}
#endif /* ifdef MACRO_H */