An initializer list is on option that can be used, depending on the standard used:

initializer list in the C++98 standard

initializer list is not supported in C++98.


#include <vector>



int main()

{

  std::vector<int> v = {1,2,3,4,5}; //Fails in C++98

}

Compiler output:


/MyFolder/main.cpp:5: error: in C++98 'v' must be initialized by constructor, not by '{...}'

/MyFolder/main.cpp:5: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x

/MyFolder/main.cpp:5: error: deducing from brace-enclosed initializer list requires #include <initializer_list>

/MyFolder/main.cpp:5: error: no matching function for call to 'std::vector<int, std::allocator<int> >::vector(<brace-enclosed initializer list>)'

/usr/include/c++/4.4/bits/stl_vector.h:241: candidates are: std::vector<_Tp, _Alloc>::vector(const std::vector<_Tp, _Alloc>&) [with _Tp = int, _Alloc = std::allocator<int>]

/usr/include/c++/4.4/bits/stl_vector.h:207:                 std::vector<_Tp, _Alloc>::vector() [with _Tp = int, _Alloc = std::allocator<int>]

initializer list in the C++0x standard

Download the Qt Creator project 'CppInitializerList' (zip)

An initializer list is an additional initialization option:


#include <vector>



int main()

{

  std::vector<int> v = {1,2,3,4,5};

}

Technical note: the code shown is compiled successfully using the G++ 4.4.5 compiler, which is supplied with the Qt Creator 2.0.0 IDE.

Go back to Richel Bilderbeek's C++ page.

Go back to Richel Bilderbeek's homepage.

(C++) initializer list

initializer list in the C++98 standard

initializer list in the C++0x standard