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"He [the producer] intends only his gain, and he is in this, as in many other cases, led by an invisible hand to promote an end which was no part of his intention." What is the "invisible hand" referred to in this statement?
#ifndef Directive
A preprocessor directive in C/C++ used to check if a symbol has not been defined before including a section of code.
#ifdef Directive
In C/C++ programming, it is used to make compilation decisions based on whether a particular identifier has been defined earlier in the code or through command-line flags.
Conditional Compilation
A feature in some programming languages that allows the compiler to include or exclude portions of code based on certain conditions.
#ifndef Condition
A preprocessor directive in C/C++ used to check if a specific identifier is not defined before including or skipping part of the code.
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