CODEWITHSUNDEEP
c++compilation
Sirish Kumar Bethala
Sirish Kumar Bethala

Reputation: 9269

C++ Compilation Error With only one candidate function

While compiling my code I am getting the following error. Why is throwing an error if there is only one candidate?. Why can't it can use it?

error: no matching function for call to '

TemplateParameters::reset_template_params(
  const char [8],
  const char [11],
  std::vector<const Channel*>,
  bool,
  std::map<int, String, std::less<int>,
    std::allocator<std::pair<const int, String> > >&
)

'

note: candidates are:

void TemplateParameters::reset_template_params(
  String,
  String,
  std::vector<const Channel*>&,
  bool,
  std::map<int, String, std::less<int>,
    std::allocator<std::pair<const int, String> > >&
)

Upvotes: 2

Views: 11515

Answers (4)

Konrad Rudolph
Konrad Rudolph

Reputation: 545943

There are two differences between the call and the candidate:

  • The first two String arguments. If no implicit conversion from a C-string literal to this class exists, the call isn’t possible.

  • The vector vs. vector& parameter. I’m going out on a limb and assume that you are passing a temporary to a newly created vector to the function. The compiler doesn’t allow this since you cannot bind a temporary to a non-const reference. Using a const-reference instead would work here. But that of course means that the parameter cannot be modified inside the method.

    Since you didn’t show how you called the code this is of course idle speculation.

Upvotes: 4

Alok Save
Alok Save

Reputation: 206596

Your function call:

TemplateParameters::reset_template_params() passes 5 parameters and compiler cannot find a function which has the same parameters. Hence the error.

The compiler can find a function TemplateParameters::reset_template_params() but the parameters you are passing do not match to the function declaration which compiler sees for function TemplateParameters::reset_template_params().

You need to have a overloaded version of TemplateParameters::reset_template_params() with exactly the same parameters you are calling your function with.

Upvotes: 0

Orochi
Orochi

Reputation: 397

Check up your parameters, Can, every thing you have given, directly translate into the parameters, e.g: String cannot be both const char[8] or const char [11] unless specified and converted explicitly

Upvotes: 0

C. K. Young
C. K. Young

Reputation: 223143

You are passing in string literals, and your function expects Strings. Does your String class have a (non-explicit) constructor that can be called with a char const*? If not, there's your problem.

Upvotes: 1

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