C++ compatibility helpers

Helper typedefs and macros that provide a single interface across C++14 and C++17-or-newer builds for optional values and Y-axis iteration helpers. More...

Macros
#define	MP_OPTNULL_INT   -1
	Null sentinel used for mpOptional_int / mpOptional_uint in the fallback implementation.
#define	MP_OPTTEST(opt)   ((opt) != -1)
	Test whether a fallback optional-style value contains a valid value.
#define	MP_OPTGET(opt)   (opt)
	Get the contained value from a fallback optional-style value.
#define	MP_LOOP_ITER   auto& elem
	Helper macro for iterating through axis maps without structured binding.
#define	m_yID   elem.first
	Alias for the Y-axis identifier when structured binding is unavailable.
#define	m_yData   elem.second
	Alias for the Y-axis data when structured binding is unavailable.

Typedefs
typedef unsigned int	mpOptional_uint
	Optional unsigned integer fallback type used when std::optional is unavailable.
typedef int	mpOptional_int
	Optional integer fallback type used when std::optional is unavailable.

Detailed Description

Helper typedefs and macros that provide a single interface across C++14 and C++17-or-newer builds for optional values and Y-axis iteration helpers.