[LLVMbugs] [Bug 13484] New: Non-capturing lambas should be a constant expression

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon Jul 30 16:22:00 PDT 2012


             Bug #: 13484
           Summary: Non-capturing lambas should be a constant expression
           Product: clang
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++11
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: pfultz2 at yahoo.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Although the standard doesn't specify if lambda expressions are literal types,
gcc does allow it, and this could be useful for when you want to have a lambda
at class scope. 

Here is an example code:

struct A
    static constexpr auto F = [](){};

int main()
    return 0;

Clang produces this error:

error: constexpr variable 'F' must be initialized by a constant
    static constexpr auto F = [](){};

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