I am making a small vocabulary remembering program where words would would be flashed at me randomly for meanings. I want to use standard C++ library as Bjarne Stroustroup tells us, but I have encountered a seemingly strange problem right out of the gate. I want to change a long integer into std::string so as … Read more
I have heard from various sources (though mostly from a colleague of mine), that compiling with an optimisation level of -O3 in g++ is somehow ‘dangerous’, and should be avoided in general unless proven to be necessary. Is this true, and if so, why? Should I just be sticking to -O2? 5 Answers 5
Is there a way for gcc/g++ to dump its preprocessor defines from the command line? I mean things like __GNUC__, __STDC__, and so on. 6 Answers 6
I am trying to use a custom class as key for an unordered_map, like the following: #include <iostream> #include <algorithm> #include <unordered_map> using namespace std; class node; class Solution; class Node { public: int a; int b; int c; Node(){} Node(vector<int> v) { sort(v.begin(), v.end()); a = v[0]; b = v[1]; c = v[2]; } … Read more
I’m trying to update my C++ compiler to C++11. I have searched a bit and I have come to the conclusion that I have to use the flag -std=c++0x or -std=gnu++0x, but I don’t know many things about flags. Can anyone help me? (I’m using Ubuntu 12.04.) Here is the error that I get from … Read more
When building my C++ program, I’m getting the error message undefined reference to ‘vtable… What is the cause of this problem? How do I fix it? It so happens that I’m getting the error for the following code (The class in question is CGameModule.) and I cannot for the life of me understand what the … Read more
I’m trying to compile my program and it returns this error : usr/bin/ld: cannot find -l<nameOfTheLibrary> in my makefile I use the command g++ and link to my library which is a symbolic link to my library located on an other directory. Is there an option to add to make it work please? 14 s … Read more
What is the difference between g++ and gcc? Which one of them should be used for general c++ development? 10 s 10
