Vector c++ 98 error

Question

so ive been reading multiple (and resent) c++ books and learning about vectors and they all are telling me to define a vector like this:

 vector<int> v1 = {4 ,3 ,5};

however when i compile it (Im using gnu gcc compiler in codeblocks) it comes up with this error

in c++ 98 'v1' must be initialized by constructor not by '{...}' and i also get another one underneath that that sais: could not convert '{4, 3, 5}' from 'brace enclosed initializer list' to 'std::vector v1'

if you could help me it'd be much appreciated. And i did include the vector library.

which compiler are you using and why do you use C++98 nowadays? — myaut, Mar 23 '16 at 08:31
no im using the GCC compiler, im pretty sure its using c++14 because it lets me do c++14 things. — Harry the hacker, Mar 23 '16 at 08:34
How do you compile your code? Command line, make file, script? — Mohit Jain, Mar 23 '16 at 08:36
AFAIK gcc has c++11 by default only since 5.x branch. Older versions (4.x) require `-std=c++11` flag to be used. — myaut, Mar 23 '16 at 09:13

score 20 · Accepted Answer · edited May 23 '17 at 12:26

Initialization used by you is called initializer list and it is supported c++11 onwards.

To ensure code is compiled, use C++11 or later -std option. Or in general, don't use C++98.

If you are using g++, please read: Compiling C++11 with g++

From comments OP is using codeblocks. You can use the following steps before hitting the compile button: (Source: How can I add C++11 support to Code::Blocks compiler?)

Go to Toolbar -> Settings -> Compiler

In the "Selected compiler" drop-down menu, make sure "GNU GCC Compiler" is selected

Below that, select the "compiler settings" tab and then the "compiler flags" tab underneath

In the list below, make sure the box for "Have g++ follow the C++11 ISO C++ language standard [-std=c++11]" is checked

Click OK to save

Thank you so much, you were a big help! – Harry the hacker Mar 26 '16 at 13:48 — Harry the hacker, Mar 26 '16 at 13:48
@Harrythehacker I'm glad that it helped you. – Mohit Jain Mar 26 '16 at 16:27 — Mohit Jain, Mar 26 '16 at 16:27

Vlad from Moscow · Answer 2 · 2016-03-23T09:15:15.687

The C++98 Standard does not support initializer lists to initialize standard containers.

Try to set appropriate compiler options to compile the code according to the C++ 2011 Standard.

Another approach is to add elements to the vector individually like

std::vector<int> v1;
v1.reserve( 3 );

v1.push_back( 4 );
v1.push_back( 3 );
v1.push_back( 5 );

Instead of the member function push_back you can use overloaded operator +=. For example

std::vector<int> v1;
v1.reserve( 3 );

v1 += 4;
v1 += 3;
v1 += 5;

Or to use an array like

const size_t N = 3;
int a[N] = { 4, 3, 5 };
std::vector<int> v1( a, a + N );

score 4 · Answer 3 · answered Jan 07 '17 at 23:53

Compile with the -std=c++11 compiler option at the end of the line in the makefile.

So for example:

g++ -ggdb -O0 -c ENiX_Chocky.cpp -std=c++11
g++ -ggdb -O0 -c ENiX_NLPTest.cpp -std=c++11
...

Then when you link, use the -std=c++11 option again:

g++ -ggdb -O0 ENiX_Chocky.cpp ENiX_NLPTest.cpp -o CLINLPTest.cpp -std=c++11

The error will immediately disappear.

score 2 · Answer 4 · answered Apr 09 '20 at 16:15

Follow these steps if you are using Codeblocks:

1.Go to Toolbar -> Settings -> Compiler

2.In the "Selected compiler" drop-down menu, make sure "GNU GCC Compiler" is selected.

3.Below that, select the "compiler settings" tab and then the "compiler flags" tab underneath.

4.In the list below, make sure the box for "Have g++ follow the C++11 ISO C++ language standard [-std=c++11]" is checked.

5.Click OK to save

score -1 · Answer 5 · edited Sep 12 '19 at 12:52

-1

Intilizer_list only supported on c++11 onwards.

Compile your program as below :

If you are using c++11 features then follow -std=c++11 option;
If you are using c++14 features then follow -std=c++14 option.

EX:

gcc Temp.cpp -std=c++11 -o out_put
gcc Temp.cpp -std=c++14 -o out_put

edited Sep 12 '19 at 12:52

Obsidian

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answered Sep 12 '19 at 11:40

Mukesh Kumar

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Vector c++ 98 error

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