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10 SWIG and C++20

Introduction
Core language changes
- Spaceship operator
- Lambda templates
Standard library changes

10.1 Introduction

This chapter gives you a brief overview about the SWIG implementation of the C++20 standard. Work has only just begun on adding C++20 support.

Compatibility note: SWIG-4.1.0 is the first version to support any C++20 features.

10.2 Core language changes

10.2.1 Spaceship operator

SWIG supports the spaceship operator <=> in constant expressions. To simplify handling of the return value type, it is currently treated as an integer rather than std::strong_ordering, etc. In practice we think that should do the right thing in most cases.

SWIG also recognises operator<=> which can be wrapped if renamed. There is not currently any default renaming for the operator or any attempt to automatically map it to a three-way comparison operator in any of the target languages.

10.2.2 Lambda templates

SWIG should parse lambda templates, but like non-templated lambdas they aren't currently wrapped.