C++ Archives - Page 58 of 68

How do I erase an element from std::vector by index?

I have a std::vector<int>, and I want to delete the n’th element. How do I do that? std::vector<int> vec; vec.push_back(6); vec.push_back(-17); vec.push_back(12); vec.erase(???); ...

April 29, 2022
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“std::endl” vs “\n”

Many C++ books contain example code like this… std::cout << "Test line" << std::endl; …so I’ve always done that too. But I’ve seen ...

April 29, 2022
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Storing C++ template function definitions in a .CPP file

I have some template code that I would prefer to have stored in a CPP file instead of inline in the header. I ...

April 29, 2022
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Why is iostream::eof inside a loop condition (i.e. `while (!stream.eof())`) considered wrong?

I just found a comment in this answer saying that using iostream::eof in a loop condition is “almost certainly wrong”. I generally use ...

April 29, 2022
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Why are #ifndef and #define used in C++ header files?

I have been seeing code like this usually in the start of header files: #ifndef HEADERFILE_H #define HEADERFILE_H And at the end of ...

April 28, 2022
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Check if a string contains a string in C++

I have a variable of type std::string. I want to check if it contains a certain std::string. How would I do that? Is ...

April 28, 2022
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Are the days of passing const std::string & as a parameter over?

I heard a recent talk by Herb Sutter who suggested that the reasons to pass std::vector and std::string by const & are largely ...

April 28, 2022
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When can I use a forward declaration?

I am looking for the definition of when I am allowed to do forward declaration of a class in another class’s header file: ...

April 28, 2022
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How do I find the length of an array?

Is there a way to find how many values an array has? Detecting whether or not I’ve reached the end of an array ...

April 28, 2022
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How can I convert a std::string to int?

I want to convert a string to an int and I don’t mean ASCII codes. For a quick run-down, we are passed in ...

April 28, 2022
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