Compiler Support
Let's look at the compiler support for the updates from C++17 with respect to templates.
| Feature | GCC | Clang | MSVC |
|---|---|---|---|
| Template argument deduction for class templates | 7.0/8.0[^gccimprov] | 5.0 | VS 2017 15.7 |
| Deduction Guides in the Standard Library | 8.0[^gccguides] | 7.0/in progress[^clangdeductionprogress] | VS 2017 15.7 |
| Declaring non-type template parameters with auto | 7.0 | 4.0 | VS 2017 15.7 |
| Fold expressions | 6.0 | 3.9 | VS 2017 15.5 |
if constexpr |
7.0 | 3.9 | VS 2017 |
[^gccimprov]: Additional improvements for Template Argument Deduction for Class Templates happened in GCC 8.0, P0512R0.
[^gccguides]: Deduction Guides are not listed in the status pages of LibSTDC++, so we can assume they were implemented as part of Template argument deduction for class templates.
[^clangdeductionprogress]: The status page for LibC++ mentions that <string>, sequence containers, container adaptors and <regex> portions have been implemented so far.
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