When does a process get SIGABRT (signal 6)?

abort() sends the calling process the SIGABRT signal, this is how abort() basically works. abort() is usually called by library functions which detect an internal error or some seriously broken constraint. For example malloc() will call abort() if its internal structures are damaged by a heap overflow.

How to convert an instance of std::string to lower case

Adapted from Not So Frequently Asked Questions: You’re really not going to get away without iterating through each character. There’s no way to know whether the character is lowercase or uppercase otherwise. If you really hate tolower(), here’s a specialized ASCII-only alternative that I don’t recommend you use: Be aware that tolower() can only do a per-single-byte-character substitution, which … Read more

error: redefinition of class

You should structure your code between .h (headers) and .cpp files (implementation). You should include header files: .h Never include .cpp files. (Unless you know what you do, and that would be in really rare cases). Otherwise you’re ending compiling several times your class, and you get the error your compiler is telling you: ‘redefinition of class…’ An additional … Read more

What does “#include ” do?

In order to read or write to the standard input/output streams you need to include it. That program will not compile unless you add #include <iostream> The second line isn’t necessary What that does is tell the compiler that symbol names defined in the std namespace are to be brought into your program’s scope, so you can omit … Read more

error : expected unqualified-id before return in c++

when I want to compile I get : Probléme : expected unqualified-id before “return” return 0; about last line : erreur:expexted declaration before { token I left the code unchanged just the middle part I changed… whats the problem??? here is my code:

Why am I getting this redefinition of class error?

You’re defining the class in the header file, include the header file into a *.cpp file and define the class a second time because the first definition is dragged into the translation unit by the header file. But only one gameObject class definition is allowed per translation unit. You actually don’t need to define the … Read more

C++ IDE for Macs

Xcode which is part of the MacOS Developer Tools is a great IDE. There’s also NetBeans and Eclipse that can be configured to build and compile C++ projects. Clion from JetBrains, also is available now, and uses Cmake as project model.

How do I declare a 2d array in C++ using new?

If your row length is a compile time constant, C++11 allows See this answer. Compilers like gcc that allow variable-length arrays as an extension to C++ can use new as shown here to get fully runtime-variable array dimension functionality like C99 allows, but portable ISO C++ is limited to only the first dimension being variable. Another efficient option is … Read more

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