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Questions tagged [overload-resolution]

Overload resolution is a language mechanism to select among several viable function overloads. Its rules are intricate and often surprising, even for experienced users.

Overload resolution is a language mechanism to select among several viable function overloads.

Possible functions overloads are first determined from a candidate list resolution that itself includes inter ala. name lookups, template or generic determination and instantiation, promotions and conversions.

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Problems with ParamArray on XDocument constructor

XDocument has an overloaded constructor. XDocument() XDocument([ParamArray] content: obj[]) XDocument(XDocument) XDocument(XDeclaration,[ParamArray] content: obj[]) so when I try to create an XDocument new XDocument( new…
MrD at KookerellaLtd
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How to fix E2015 "ambiguity between pow(double,double) and pow(float,int)"

I'm doing my homework in C++ Builder 6. When I try to get a cubic root from variable X, I get this error: result = std::pow(x, 1.0 / 3); E2015 Ambiguity between "std::pow(double,double)" and "std::pow(float, int)" What should i do to fix this?…
Vladimir Dragun
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Is there a way to force this ambiguity away?

I'd like to supply two forms of a GetLength(psz) style function - one that doesn't know an upper bounds, and one that does: template size_t GetLength(const T * psz) { /* compute size w/o knowing what upper bound may be */ } template…
Mordachai
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Template function overload resolution of T vs. SomeClass

I want to understand why the void handleParam(const Str& name, Table value) template overload never gets instantiated (note that the code below is illustrative). I'm sure there is a perfectly good reason why it doesn't work, I just want to…
sleep
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How do I force a Java call to overloaded Kotlin method accepting a non-nulllable parameter?

In Kotlin, I have two overloaded methods defined on an object. They have the same signature except that in one case, a parameter is nullable and in the other case, that same parameter is not. Based on if the passed in parameter is nullable or not,…
CryptoFool
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Template class member vs. non-member template function ambiguity

I'm developing a header-only library for automatic/algorithmic differentiation. The goal is to be able to simply change the type of the variables being fed to a function and calculate first and second derivatives. For this, I've created a template…
Matt Osborne
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How to parametrize an algorithm with a custom non-pure swap-function?

I want to apply an algorithm from on ranges of elements, containing in one container, defined by iterator pairs, containing into another one. To do this I need a swap function with state: just pointer to the container with elements to…
Tomilov Anatoliy
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Called function instance must depend on parameter

I would like to make the function call depend on the parameter, that is, what version of the function is being called. I'm looking for a way to make the following code work, without making enum_value v a template argument. The goal is that if…
Lourens Dijkstra
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detection idiom and default parameter type match

I can write the following to detect, if an object is serializable. template struct is_serializable : std::false_type {}; template struct is_serializable () <<…
Martin Fehrs
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Why there is ambiguous reference to overloaded definition in this code?

Why there is ambiguous reference to overloaded definition in this code? class A { def m(a1: A, o2: Any): A = { print("1") a1 } def m(a1: A, a2: A): A = { print("2") a1 } def m(o1: Any, o2: Any): Any = { print("3") …
CodingNow
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Overload resolution over several layers of inheritance?

Consider the following example with several layers of inheritance: struct A { void operator()(double x); }; struct B: A { using A::operator(); template void operator()(T... x); }; struct C: B { using B::operator(); …
Vincent
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Cannot call overloaded methods of .NET API in PowerShell

I have a 3rd party API that I want to use in a PowerShell script. I can instantiate the objects and access properties and non-overloaded methods, but every call to an overloaded method fails with Cannot find an overload for "" and the…
aucuparia
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Overload resolution, name lookup and function pointers

I have a case where lookup and overload resolution behaves differently: for user-defined class vs built-in types vs std::string for direct call vs function pointer call I cannot figure what exact parts of the standard justify these…
salmin
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Rationale behind universal reference template function being a more viable match than non-template function?

Given a template member function (... a templated constructor in a templated class, as it happens) taking a variadic universal reference, and another candidate function (copy constructor, in my case), both GCC and clang select the universal…
Damon
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How to deal with const T& and T&& instantiating to the same signature?

Basically I want to provide construction from const lvalue versions and rvalue reference versions: transform_iterator(const Functor& f, const Iterator& it) : functor(f), iterator(it) {} …
Incomputable
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