CODEWITHSUNDEEP
c++constructorvisual-studio-2013intellisensebase-class
Maximal
Maximal

Reputation: 165

Can't call base class constructor with brace initialization intellisense error

I just encountered the following problem:

#include "stdafx.h"
#include <string>
#include <iostream>

class transaction{
protected:
    transaction(const std::string& log) { printLog(log); }
private:
    void printLog(const std::string& log) const { std::cout << log << "\n"; }
};

class inTrans : public transaction {
public:
    inTrans() : transaction( std::string("input") ) { }
};

class outTrans : public transaction {
public:
    outTrans() : transaction{ std::string("output") } { } //This doesn't work
};

Visual Studio 2013 marks the first "{"-red and shows the following error:

"Error protected function "transaction::transaction(const std::string &log)" (declared at line 7) is not accessible through a "transaction" pointer or object."

The thing is that I'm still able to compile the file and everything seems to be running just fine. So why do I get this strange error?

Upvotes: 4

Views: 670

Answers (1)

Shafik Yaghmour
Shafik Yaghmour

Reputation: 158529

If we look at the draft C++ standard the grammar in section 12.6.2 Initializing bases and members indicates what you have is valid syntax so the error is a bug:

ctor-initializer:
    : mem-initializer-list
mem-initializer-list:
    mem-initializer ...opt
    mem-initializer , mem-initializer-list ...opt
mem-initializer:
    mem-initializer-id ( expression-listopt)
    mem-initializer-id braced-init-list  <-- this applies to this case

The code also compiles fine with both gcc and clang

Upvotes: 4

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