The declaration and definition of insertLike are different In your header file: void insertLike(const char sentence[], const int lengthTo, const int length, const char writeTo[]); In your ‘function file’: void insertLike(const char sentence[], const int lengthTo, const int length,char writeTo[]); C++ allows function overloading, where you can have multiple functions/methods with the same name, as long as they … Read more
There is statement that the compiler can’t pass. I can’t understand it. Can anyone tell me in detail or How to fix it ? Best wishes to you. The statement as follow: The compiler given the information as follow: The std::priority_queue inducted in cppreference site:http://en.cppreference.com/w/cpp/container/priority_queue mainly structure as follow:
In the context of MPI, application buffer (often called user buffer) is the buffer that holds information to be sent or the place where information is to be received. Applications buffers are what one passes to MPI communication calls, e.g. Once MPI_Send is called, a message is constructed and depending on various criteria is either … Read more
This is C++11 code. In C++11, the && token can be used to mean an “rvalue reference”.
Does it for me, it is a valid C++ syntax to convert a string to a double. You can do it with the stringstream or boost::lexical_cast but those come with a performance penalty. Ahaha you have a Qt project … Extra note:If the input data is a const char*, QByteArray::toDouble will be faster.
In C++ NULL expands to 0 or 0L. See this quote from Stroustrup’s FAQ: Should I use NULL or 0? In C++, the definition of NULL is 0, so there is only an aesthetic difference. I prefer to avoid macros, so I use 0. Another problem with NULL is that people sometimes mistakenly believe that … Read more
This is a char: It can only hold one character! This is a C-string: It can hold multiple characters. Another way to write the above is: The 0 at the end is called the NUL terminator. It denotes the end of a C-string. A char* stores the starting memory location of a C-string.1 For example, … Read more
Virtual destructors are useful when you might potentially delete an instance of a derived class through a pointer to base class: Here, you’ll notice that I didn’t declare Base’s destructor to be virtual. Now, let’s have a look at the following snippet: Since Base’s destructor is not virtual and b is a Base* pointing to … Read more
Deleting a function is a C++11 feature: The common idiom of “prohibiting copying” can now be expressed directly: […] The “delete” mechanism can be used for any function. For example, we can eliminate an undesired conversion like this:
Reviewing the basic terminology It’s usually good enough – unless you’re programming assembly – to envisage a pointer containing a numeric memory address, with 1 referring to the second byte in the process’s memory, 2 the third, 3 the fourth and so on…. What happened to 0 and the first byte? Well, we’ll get to … Read more