Validate Text Against a List of Values
April 13, 2002
I often find it necessary to check that a string is valid by ensuring it exists in a list of strings. For instance, you might need to check that a
I often find it necessary to check that a string is valid by ensuring it exists in a list of strings. For instance, you might need to check that a
In general, disabling inheritance is a dubious idea. Yet under some circumstances it may be useful. To do this, declare the class in question (called A in our example) as
Sometimes you don’t want to enable the option of running more than one instance of an executable at a time. This can be achieved by using this fragment of code:
The algorithms in the standard C++ library are generic and, as such, can be inefficient (or unavailable) with certain containers.For example, the std::swap algorithm is generic but lists define an
C-style arrays can be passed as containers to STL algorithms. The pointers to array elements can be used as iterators.Example: #include #include int main(){ int array[] = { 1, 3,
If no other classes can derive from a class, then you know that all the pointers to that class point to objects of a uniform size. This can simplify memory
There is nothing intrinsically evil about ‘switch’ statements. However, they do sometimes result from improper Object Oriented design. There are twodesign principles to keep in mind.1. Open/Closed Principle: this states