CODEWITHSUNDEEP
c++stl
AnilJ
AnilJ

Reputation: 2121

error: conversion from ‘<unresolved overloaded function type>’ to non-scalar type

A LSR configuration class is defined as:

 29 namespace ns3 {
 30 namespace lsr {
 31 
 32 #include <map>
 33 #include <vector>
 34 
 35 class LsrConfig : public Object
 36 {
 37 
 38 public:
 39 
 40   LsrConfig ();
 41   ~LsrConfig ();
 42 
208 };
209
210 }} // namespace lsr,ns3

I am using an instance of above class as follows.

172   //@@Set configuration.
174   Ptr<lsr::LsrConfig> lsrConfig = CreateObject<lsr::LsrConfig()>;
175   lsrConfig->SetNetworkAttributes (network, site, routerName, logLevel);
176   lsrConfig->SetHelloProtocolAttributes (helloRetries, helloTimeout, helloInterval, adjLsaBuildInterval, firstHelloInterval);

and getting the following compilation error. Can someone please explain why this error coming?

../src/lsr-topology-reader.cc: In member function ‘ns3::Ptr<ns3::Node> ns3::LsrTopologyReader::CreateNode(std::string, double, double, std::string, std::string, std::string, std::string, double, double, double, double, double, double, double, std::string, double, double, std::string, double, double, uint32_t)’:
../src/lsr-topology-reader.cc:174:38: error: conversion from ‘<unresolved overloaded function type>’ to non-scalar type ‘ns3::Ptr<ns3::lsr::LsrConfig>’ requested

Upvotes: 3

Views: 6780

Answers (2)

Bob Kocisko
Bob Kocisko

Reputation: 602

Here is another example which can cause this error:

struct A
{
};
std::shared_ptr<A> a = std::make_shared<A>;

error: conversion from ‘<unresolved overloaded function type>’ to non-scalar type ‘std::shared_ptr<main()::A>’ requested

And the solution is again to add parenthesis:

std::shared_ptr<A> a = std::make_shared<A>();

Upvotes: 2

awesoon
awesoon

Reputation: 33691

It is just a typo: you should call the method CreateObject, but instead of it you are trying to pass object of type LsrConfig as template parameter:

// Ptr<lsr::LsrConfig> lsrConfig = CreateObject<lsr::LsrConfig()>;
//                                      note the parenthesis  ^^ vv
   Ptr<lsr::LsrConfig> lsrConfig = CreateObject<lsr::LsrConfig  >();

Upvotes: 5

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