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'const' qualifier on return type has no effect
Remarks
The C++ Standard specifies that a top-level const (or volatile) qualification on a function return type is ignored.
This warning is off by default.
This warning was introduced in Visual Studio 17.6
Example
The following example generates C5266:
// compile with: /W4 /c
#pragma warning(default : 5266) // enable warning C5266 because it's off by default (or compile with /w45266)
const int f() // warning C5266: 'const' qualifier on return type has no effect
{
return 13;
}