comparator.hh File Reference

#include <tuple>

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Macros
#define	DECLARE_ONE_CMP(PRE, QUAL, COMPARATOR, MY_TYPE)    PRE bool QUAL operator COMPARATOR(const MY_TYPE & other) const;
#define	DECLARE_EQUAL(prefix, qualification, my_type)    DECLARE_ONE_CMP(prefix, qualification, ==, my_type)
#define	DECLARE_LEQ(prefix, qualification, my_type)    DECLARE_ONE_CMP(prefix, qualification, <, my_type)
#define	DECLARE_NEQ(prefix, qualification, my_type)    DECLARE_ONE_CMP(prefix, qualification, !=, my_type)
#define	GENERATE_ONE_CMP(PRE, QUAL, COMPARATOR, MY_TYPE, ...)
#define	GENERATE_EQUAL(prefix, qualification, my_type, args...)    GENERATE_ONE_CMP(prefix, qualification, ==, my_type, args)
#define	GENERATE_LEQ(prefix, qualification, my_type, args...)    GENERATE_ONE_CMP(prefix, qualification, <, my_type, args)
#define	GENERATE_NEQ(prefix, qualification, my_type, args...)    GENERATE_ONE_CMP(prefix, qualification, !=, my_type, args)
#define	DECLARE_CMP(my_type)
#define	DECLARE_CMP_EXT(prefix, qualification, my_type)
#define	GENERATE_CMP(args...)
#define	GENERATE_CMP_EXT(prefix, my_type, args...)

Macro Definition Documentation

DECLARE_CMP

#define DECLARE_CMP

(

my_type

)

Value:

    DECLARE_EQUAL(,,my_type) \
    DECLARE_LEQ(,,my_type) \
    DECLARE_NEQ(,,my_type)

Declare comparison methods without defining them.

DECLARE_CMP_EXT

#define DECLARE_CMP_EXT	(		prefix,
			qualification,
			my_type )

Value:

    DECLARE_EQUAL(prefix, qualification, my_type) \
    DECLARE_LEQ(prefix, qualification, my_type) \
    DECLARE_NEQ(prefix, qualification, my_type)

Parameters

prefix	This is for something before each declaration like template<classname Foo>.
my_type	the type are defining operators for.

GENERATE_CMP

#define GENERATE_CMP

(

args...

)

Value:

    GENERATE_EQUAL(,,args) \
    GENERATE_LEQ(,,args) \
    GENERATE_NEQ(,,args)

Awful hacky generation of the comparison operators by doing a lexicographic comparison between the choosen fields.

GENERATE_CMP(ClassName, me->field1, me->field2, ...)

will generate comparison operators semantically equivalent to:

bool operator<(const ClassName& other) {
  return field1 < other.field1 && field2 < other.field2 && ...;
}

GENERATE_CMP_EXT

#define GENERATE_CMP_EXT	(		prefix,
			my_type,
			args... )

Value:

    GENERATE_EQUAL(prefix, my_type ::, my_type, args) \
    GENERATE_LEQ(prefix, my_type ::, my_type, args) \
    GENERATE_NEQ(prefix, my_type ::, my_type, args)

Parameters

prefix	This is for something before each declaration like template<classname Foo>.
my_type	the type are defining operators for.

GENERATE_ONE_CMP

#define GENERATE_ONE_CMP	(		PRE,
			QUAL,
			COMPARATOR,
			MY_TYPE,
			... )

Value:

    PRE bool QUAL operator COMPARATOR(const MY_TYPE & other) const { \
      __VA_OPT__(const MY_TYPE * me = this;) \
      auto fields1 = std::tie( __VA_ARGS__ ); \
      __VA_OPT__(me = &other;) \
      auto fields2 = std::tie( __VA_ARGS__ ); \
      return fields1 COMPARATOR fields2; \
    }