[llvm-bugs] [Bug 51464] New: std::lerp is missing Arithmetic overloads

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=51464

            Bug ID: 51464
           Summary: std::lerp is missing Arithmetic overloads
           Product: libc++
           Version: 12.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: konstantinua00 at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

According to C++20 standard paragraph 20.8.1.2 ( [cmath.syn] ), std::lerp is
not an exception to expansion of acceptable parameters to integral and mixed
floating point types.
I.e. overload 4) from https://en.cppreference.com/w/cpp/numeric/lerp is
missing.

Example code (compile with -std=c++20):

#include<cmath>

int main()
{
    std::lerp(int{},int{},int{});
    std::lerp(float{}, double{}, (long double)0);
}

https://godbolt.org/z/vboY4aoE9

Current behaviour:
Does not compile with: "error: call to 'lerp' is ambiguous" (twice)

Expected behaviour:
Compilation with no issues.

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