Any business must carefully consider supply and demand. For example, if the ReVo Corporation thinks that it will have a full-fledged fad on their ovoid sunglasses next summer, perhaps they should plan to build and distribute, say, 10M units. This involves gearing up factories, setting up distribution and dealer networks, and carefully managing the inventories at each level so that ReVo will still have credibility with their distributors, retail outlets, and the public the following year.
If it turns out that there is a "run" on ReVo products, and they sell out in mid-June, then they have miscalculated demand and will miss out on profits they could have made. The more serious problem, however, is overestimating the saturation point for the product. If they make 10M units, and sell only 2M units, this may be the end of ReVo as a company.
The all-too-obvious point here is that management of supply and demand, and keen insight into realistic market penetration and saturation are crucial to any business, for any product or service. Mismanagement of this aspect of a business will eclipse good market access, excellent product design, human resource assets, production quality, and so on. Simply stated, a failure to "hit the target" of supply and demand can ruin a company if the market is oversaturated.
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From the point of view of the compiler, templates are not normal functions or classes. They are compiled on demand, meaning that the code of a template function is not compiled until an instantiation with specific template arguments is required. At that moment, when an instantiation is required, the compiler generates a function specifically for those arguments from the template.
When projects grow it is usual to split the code of a program in different source code files. In these cases, the interface and implementation are generally separated. Taking a library of functions as example, the interface generally consists of declarations of the prototypes of all the functions that can be called. These are generally declared in a "header file" with a .h extension, and the implementation (the definition of these functions) is in an independent file with c++ code.
Because templates are compiled when required, this forces a restriction for multi-file projects: the implementation (definition) of a template class or function must be in the same file as its declaration. That means that we cannot separate the interface in a separate header file, and that we must include both interface and implementation in any file that uses the templates.
Since no code is generated until a template is instantiated when required, compilers are prepared to allow the inclusion more than once of the same template file with both declarations and definitions in a project without generating linkage errors.
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