A type with a small-buffer optimisation stores small contents inside the object and allocates only for large ones: the GNU implementation of std::string holds up to 15 characters inline. A fixed-capacity container always stores its elements inside the object, up to a capacity fixed at compile time, and refuses to grow beyond it.
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O que é Small-buffer optimisation, fixed-capacity container?
Também chamado de: small-buffer optimisation · fixed-capacity container