79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
#pragma once
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///@file
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#include <tuple>
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#define DECLARE_ONE_CMP(PRE, QUAL, COMPARATOR, MY_TYPE) \
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PRE bool QUAL operator COMPARATOR(const MY_TYPE & other) const;
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#define DECLARE_EQUAL(prefix, qualification, my_type) \
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DECLARE_ONE_CMP(prefix, qualification, ==, my_type)
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#define DECLARE_LEQ(prefix, qualification, my_type) \
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DECLARE_ONE_CMP(prefix, qualification, <, my_type)
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#define DECLARE_NEQ(prefix, qualification, my_type) \
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DECLARE_ONE_CMP(prefix, qualification, !=, my_type)
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#define GENERATE_ONE_CMP(PRE, QUAL, COMPARATOR, MY_TYPE, ...) \
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PRE bool QUAL operator COMPARATOR(const MY_TYPE & other) const { \
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__VA_OPT__(const MY_TYPE * me = this;) \
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auto fields1 = std::tie( __VA_ARGS__ ); \
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__VA_OPT__(me = &other;) \
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auto fields2 = std::tie( __VA_ARGS__ ); \
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return fields1 COMPARATOR fields2; \
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}
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#define GENERATE_EQUAL(prefix, qualification, my_type, args...) \
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GENERATE_ONE_CMP(prefix, qualification, ==, my_type, args)
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#define GENERATE_LEQ(prefix, qualification, my_type, args...) \
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GENERATE_ONE_CMP(prefix, qualification, <, my_type, args)
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#define GENERATE_NEQ(prefix, qualification, my_type, args...) \
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GENERATE_ONE_CMP(prefix, qualification, !=, my_type, args)
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/**
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* Declare comparison methods without defining them.
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*/
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#define DECLARE_CMP(my_type) \
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DECLARE_EQUAL(,,my_type) \
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DECLARE_LEQ(,,my_type) \
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DECLARE_NEQ(,,my_type)
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/**
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* @param prefix This is for something before each declaration like
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* `template<classname Foo>`.
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*
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* @param my_type the type are defining operators for.
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*/
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#define DECLARE_CMP_EXT(prefix, qualification, my_type) \
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DECLARE_EQUAL(prefix, qualification, my_type) \
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DECLARE_LEQ(prefix, qualification, my_type) \
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DECLARE_NEQ(prefix, qualification, my_type)
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/**
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* Awful hacky generation of the comparison operators by doing a lexicographic
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* comparison between the choosen fields.
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*
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* ```
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* GENERATE_CMP(ClassName, me->field1, me->field2, ...)
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* ```
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*
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* will generate comparison operators semantically equivalent to:
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*
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* ```
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* bool operator<(const ClassName& other) {
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* return field1 < other.field1 && field2 < other.field2 && ...;
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* }
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* ```
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*/
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#define GENERATE_CMP(args...) \
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GENERATE_EQUAL(,,args) \
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GENERATE_LEQ(,,args) \
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GENERATE_NEQ(,,args)
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/**
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* @param prefix This is for something before each declaration like
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* `template<classname Foo>`.
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*
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* @param my_type the type are defining operators for.
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*/
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#define GENERATE_CMP_EXT(prefix, my_type, args...) \
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GENERATE_EQUAL(prefix, my_type ::, my_type, args) \
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GENERATE_LEQ(prefix, my_type ::, my_type, args) \
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GENERATE_NEQ(prefix, my_type ::, my_type, args)
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