Intellisense not interpreting C++17 auto correctly

[jeffbi]

Type: LanguageService

• OS and Version: Linux Mint 64-bit
• VS Code Version: 1.24.0
• C/C++ Extension Version: 0.17.4

Intellisense interprets the construct auto p{"Fred"} as deduction of an initializer list. In C++17 that should not be the case.

To Reproduce
Use the following C++17 main.cpp file:

int main()
{
    auto s = "fred";
    auto p{s};
}

along with the following (auto-generated) c_cpp_properties.json file:

{
    "configurations": [
        {
            "name": "Linux",
            "browse": {
                "path": [
                    "${workspaceFolder}"
                ],
                "limitSymbolsToIncludedHeaders": true
            },
            "includePath": [
                "${workspaceFolder}"
            ],
            "defines": [],
            "compilerPath": "/usr/bin/gcc",
            "cStandard": "c11",
            "cppStandard": "c++17",
            "intelliSenseMode": "clang-x64"
        }
    ],
    "version": 4
}

Red squiggles appear under auto p. Intellisense is seeing this line as a deduction of an initializer list.

Expected behavior
auto p{s} should be recognized as p being a const char *.

[sean-mcmanus]

Thanks for reporting this. It appears to be a bug with our "clang-x64" mode, and doesn't repro with the msvc-x64 mode.

[sean-mcmanus]

This appears fixed in 0.17.7 -- not sure what release actually fixed it. 0.17.8-insiders has more fixes for other scenarios: https://github.com/Microsoft/vscode-cpptools/releases/tag/v0.17.8-insiders , and we made several more parser fixes that haven't been released yet (https://github.com/Microsoft/vscode-cpptools/milestone/14 ).

[sean-mcmanus]

Correction -- it's not fixed in 0.17.7, but it is in 0.17.8-insiders. Also, your compiler library needs to be a new enough version (I tested with gcc-8) or you'll need to #include <initializer_list>.

[jeffbi]

Nice. Thank you.