C++ string to enum
A std::map<std::string, MyEnum> (or unordered_map) could do it easily. Populating the map would be just as tedious as the switch statement though. Edit: Since C++11, populating is trivial:
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C++ Class ‘undeclared identifier”
This is really frustrating, I’ve tried multiple variations of my class and constructor, sifted through pages of google results and other questions on this site but I can’t figure it out. I believe the error is something simple that I’m overlooking. Error code: student.h student.cpp main.cpp Just as a note, my professor said adding #include … Read more
C++ Erase vector element by value rather than by position?
How about std::remove() instead: This combination is also known as the erase-remove idiom.
PlaySound in C++ Console application?
How can I play sounds without freezing the console? If you Google for PlaySound this is the first result: fdwSound … SND_ASYNC The sound is played asynchronously and PlaySound returns immediately after beginning the sound. To terminate an asynchronously played waveform sound, call PlaySound with pszSound set to NULL. You should familiarise yourself with search … Read more
extended initializer lists only available with
This style of initialisation, using braces: was introduced to the language in 2011. Older compilers don’t support it; some newer ones (like yours) only support it if you tell them; for your compiler: However, this form of initialisation still isn’t valid for arrays created with new. Since it’s small and only used locally, you could … Read more
C++ Remove punctuation from String
I got a string and I want to remove all the punctuations from it. How do I do that? I did some research and found that people use the ispunct() function (I tried that), but I cant seem to get it to work in my code. Anyone got any ideas?
Error: C2228: left of ” must have class/struct/union
You made an error here: You declared a function called myDBControl taking no arguments and returning a DatabaseControl. Object declarations without any constructor arguments must omit the (): This is related to (but is not precisely) the “most vexing parse“, in that it’s caused by the same language rule that statements are function declarations if … Read more
gdb error not in executable format: File format not recognized
I am trying to debug a simple “hello world” C++ program on Ubuntu 16.04 but gdb is not able to recognize the executable file format. However, I am able to successfully run the executable on the command line. Here is the code I compile the program file TestProject.cpp using the command Then to debug, I … Read more
Remove First and Last Character C++
Well, you could erase() the first character too (note that erase() modifies the string): But in this case, a simpler way is to take a substring: Be careful to validate that the string actually has at least two characters in it first…
C++ template constructor
There is no way to explicitly specify the template arguments when calling a constructor template, so they have to be deduced through argument deduction. This is because if you say: The <int> is the template argument list for the type Foo, not for its constructor. There’s nowhere for the constructor template’s argument list to go. … Read more