String literals are constant and should consequently be protected by const qualification. This recommendation supports rule STR30-C. Do not attempt to modify string literals. Adding const qualification may propagate through a program; as you add const qualifiers, still more become necessary. This phenomenon is sometimes called "const-poisoning." Const-poisoning can frequently lead to violations of EXP05-A. Do not cast away a const qualification. While const qualification is a good idea, the costs may outweigh the value when remediating existing code.
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