compat.h File Reference

Helper functions for old compilers that do not properly support C++20. More...

Namespaces
namespace	regina
	Contains the entire Regina calculation engine.

Functions
template<typename Container >
std::strong_ordering	regina::compat::lexCompare (const Container &a, const Container &b)
	Returns the lexicographical three-way comparison of the two given containers.

Detailed Description

Helper functions for old compilers that do not properly support C++20.

Function Documentation

lexCompare()

template<typename Container >

std::strong_ordering regina::compat::lexCompare	(	const Container &	a,
		const Container &	b )

Returns the lexicographical three-way comparison of the two given containers.

The type Container should be a standard container type with begin() and end() functions. The comparison itself is equivalent to a <=> b. It is intended for use with old compilers that do not properly implement spaceship operators on containers such as std::vector or std::map.

It is assumed that the elements of these containers return a std::strong_ordering when compared.

Parameters

a	the first of the two containers to compare.
b	the second of the two containers to compare.

Returns

the result of the lexicographical comparison a <=> b.