Nix 2.26.3
Nix, the purely functional package manager; unstable internal interfaces
 
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comparator.hh File Reference

Go to the source code of this file.

Macros

#define GENERATE_ONE_CMP(PRE, RET, QUAL, COMPARATOR, MY_TYPE, ...)
 
#define GENERATE_EQUAL(prefix, qualification, my_type, args...)
 
#define GENERATE_SPACESHIP(prefix, ret, qualification, my_type, args...)
 
#define GENERATE_CMP(args...)
 
#define GENERATE_CMP_EXT(prefix, ret, my_type, args...)
 

Macro Definition Documentation

◆ GENERATE_CMP

#define GENERATE_CMP ( args...)
Value:
GENERATE_EQUAL(,,args) \
GENERATE_SPACESHIP(,auto,,args)
std::vector< Expr * > args
Definition lexer.l:6126

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

GENERATE_CMP(ClassName, me->field1, me->field2, ...)
#define GENERATE_CMP(args...)
Definition comparator.hh:38

will generate comparison operators semantically equivalent to:

auto operator<=>(const ClassName& other) const noexcept {
if (auto cmp = field1 <=> other.field1; cmp != 0)
return cmp;
if (auto cmp = field2 <=> other.field2; cmp != 0)
return cmp;
...
return 0;
}

◆ GENERATE_CMP_EXT

#define GENERATE_CMP_EXT ( prefix,
ret,
my_type,
args... )
Value:
GENERATE_EQUAL(prefix, my_type ::, my_type, args) \
GENERATE_SPACESHIP(prefix, ret, my_type ::, my_type, args)
Parameters
prefixThis is for something before each declaration like template<classname Foo>.
my_typethe type are defining operators for.

◆ GENERATE_EQUAL

#define GENERATE_EQUAL ( prefix,
qualification,
my_type,
args... )
Value:
GENERATE_ONE_CMP(prefix, bool, qualification, ==, my_type, args)

◆ GENERATE_ONE_CMP

#define GENERATE_ONE_CMP ( PRE,
RET,
QUAL,
COMPARATOR,
MY_TYPE,
... )
Value:
PRE RET QUAL operator COMPARATOR(const MY_TYPE & other) const noexcept { \
__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; \
}

◆ GENERATE_SPACESHIP

#define GENERATE_SPACESHIP ( prefix,
ret,
qualification,
my_type,
args... )
Value:
GENERATE_ONE_CMP(prefix, ret, qualification, <=>, my_type, args)