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

Question

LSR 配置 class 定义为：

 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

我正在使用上述 class 的实例，如下所示。

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);

并出现以下编译错误。有人可以解释为什么会出现此错误吗？

../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

Answer 1

这只是一个拼写错误：您应该调用方法 CreateObject，但您试图将类型 LsrConfig 的对象作为模板参数传递而不是它：

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

Answer 2

这是另一个可能导致此错误的示例：

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

解决方法是再次添加括号：

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

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

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

c++

stl