What am I trying to do is to create a user library and in the Library I create a BridgeServer object. Ld.exe: : plugin needed to handle lto objectД®rror linking for board Arduino Mega 2560 - Dragino YГєnДebug build failed for project 'test_lib_sketch'Д¬*: In function global constructors keyed to 65535_0_test_lib_.2476Д¬*: (.text.startup+0x144): undefined reference to BridgeServer::BridgeServer(unsigned int, BridgeClass&)Д¬ollect2.exe*: error: ld returned 1 exit status Error report is the following:Д¬ompiling debug version of 'test_lib_sketch' for 'Arduino Mega 2560 - Dragino YГєn' And I run into a problem, when I compile this sketch under arduino IDE it does not bring error, but under Visual Micro yes. The assignment operator ( operator =) has special properties: see copy assignment and move assignment for details.I just have started to use Visual Micro under VS 2015. The return types are limited by the expressions in which the operator is expected to be used: for example, assignment operators return by reference to make it possible to write a = b = c = d, because the built-in operators allow that.Д¬ommonly overloaded operators have the following typical, canonical forms: Assignment operator The related operators are expected to behave similarly ( operator + and operator + = do the same addition-like operation). &, ||, and, (comma) lose their special sequencing properties when overloaded and behave like regular function calls even when they are used without function-call notation.Д«esides the restrictions above, the language puts no other constraints on what the overloaded operators do, or on the return type (it does not participate in overload resolution), but in general, overloaded operators are expected to behave as similar as possible to the built-in operators: operator + is expected to add, rather than multiply its arguments, operator = is expected to assign, etc.The overloads of operators & and || lose short-circuit evaluation.The overload of operator -> must either return a raw pointer, or return an object (by reference or by value) for which operator -> is in turn overloaded.It is not possible to change the precedence, grouping, or number of operands of operators.operator + = ( 'world' ) // same as str += 'world' Overloaded operators (but not the built-in operators) can be called using function notation: Note: for overloading co_await, (since C++20) user-defined conversion functions, user-defined literals, allocation and deallocation see their respective articles. In this table, is a placeholder representing all matching operators: all prefix operators in all postfix operators other than -> in all infix operators other than = in addition, for comparison operators =, ! =,, =,, overload resolution also considers the rewritten candidates generated from operator = or operator. Given std:: vector :: iterator i, i ++ calls i. Given std:: unique_ptr p, p - >bar ( ) calls p. When an operator appears in an expression, and at least one of its operands has a class type or an enumeration type, then overload resolution is used to determine the user-defined function to be called among all the functions whose signatures match the following: Member access operators: a, *a, &a, a->b, a.b, a->*b, a.*bД¦) overloaded co_await operator for use in co_await expressions. Increment and decrement: ++a, -a, a++, a. Value categories (lvalue, rvalue, xvalue)Д¬haracter literals including escape sequencesДЄ=b, a+=b, a-=b, a*=b, a/=b, a%=b, a&=b, a|=b, a^=b, a>=b

Arduino undefined visual micro >= 100