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| <H1><a name="CPlusPlus20">10 SWIG and C++20</a></H1> |
| <!-- INDEX --> |
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| <ul> |
| <li><a href="#CPlusPlus20_introduction">Introduction</a> |
| <li><a href="#CPlusPlus20_core_language_changes">Core language changes</a> |
| <ul> |
| <li><a href="#CPlusPlus20_spaceship_operator">Spaceship operator</a> |
| <li><a href="#CPlusPlus20_lambda_templates">Lambda templates</a> |
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| <li><a href="#CPlusPlus20_standard_library_changes">Standard library changes</a> |
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| <H2><a name="CPlusPlus20_introduction">10.1 Introduction</a></H2> |
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| <p>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. |
| </p> |
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| <p> |
| <b>Compatibility note:</b> SWIG-4.1.0 is the first version to support any C++20 features. |
| </p> |
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| <H2><a name="CPlusPlus20_core_language_changes">10.2 Core language changes</a></H2> |
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| <H3><a name="CPlusPlus20_spaceship_operator">10.2.1 Spaceship operator</a></H3> |
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| <p> |
| SWIG supports the spaceship operator <tt><=></tt> in constant |
| expressions. To simplify handling of the return value type, it is currently |
| treated as an integer rather than <tt>std::strong_ordering</tt>, etc. |
| In practice we think that should do the right thing in most cases. |
| </p> |
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| SWIG also recognises <tt>operator<=></tt> 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. |
| </p> |
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| <H3><a name="CPlusPlus20_lambda_templates">10.2.2 Lambda templates</a></H3> |
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| <p> |
| SWIG should parse lambda templates, but like |
| <a href="CPlusPlus11.html#CPlusPlus11_lambda_functions_and_expressions"> |
| non-templated lambdas</a> they aren't currently wrapped. |
| </p> |
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| <H2><a name="CPlusPlus20_standard_library_changes">10.3 Standard library changes</a></H2> |
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