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I'm trying to create simple database engine. I have a problem with structures.

#include <iostream> #include <vector> #include <string> using namespace std; struct LICZBY { int wartosc; }; struct STUDENCI { int indeks; string imie; string nazwisko; }; struct PRZEDMIOTY { int id; string nazwa; // auto int semestr; // clamp (1/10) }; struct SALE { string nazwa; int rozmiar; // clamp (10/600) bool projektor; double powierzchnia; }; struct TABLES { vector<LICZBY> liczby; vector<STUDENCI> studenci; vector<PRZEDMIOTY> przedmioty; vector<SALE> sale; }; int main() { TABLES tables; tables.liczby.push_back({1}); cout << tables.liczby[0].wartosc; // your code goes here return 0; }

I'm using Visual Studio 2012. This code return an error: expected an expression (here tables.liczby.push_back({1});), but code works at ideone.com. http://ideone.com/fork/zc9pz8

What is wrong? Please give me some advise.

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    Not yet supported in VS2012, available in VS2013. Commented Dec 3, 2013 at 23:10

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VS2012 does not yet support C++11 uniform initialization syntax/semantics, which is what's required for your {1} to work in this context.

  • At this time it cannot be rewritten as a one-liner for VS2012 (unless you declare a conversion constructor in your LICZBY class). For the original definition of LICZBY you can only rewrite it as

    const LICZBY liczby = { 1 }; tables.liczby.push_back(liczby);

  • If you add a conversion constructor

    struct LICZBY { int wartosc; LICZBY(int wartosc) : wartosc(wartosc) {} };

    then you'll be able to do it as

    tables.liczby.push_back(1);
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This line:

tables.liczby.push_back({1});

is trying to use an initializer list. This is supported by the gcc version used on ideone, but is not supported by VS2012. In this case, it's an easy fix:

tables.liczby.push_back(LICZBY(1));
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Easy fix? This will not compile. Class LICZBY has no constructor. Expression LICZBY(1) is invalid.

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