Appending to an std:string character-by-character: how does the capacity grow?

Re:Appending to an std:string character-by-character: how do... by gary_0 on Thursday October 26, 2023 @09:26PM (#38033666)

Also I don't think the Standard requires that data() returns a valid pointer after only calling reserve(), so it's technically UB.

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Re:Appending to an std:string character-by-character: how do... by zabzonk on Thursday October 26, 2023 @11:40PM (#38034445)

i think you may have misunderstood the standard - data() will always return a valid pointer, but the pointer returned may be invalidated by any number of functions:

    string s;
    s.reserve(50);
    char * p = s.data();   // ok so far
    s.reserve(100);        // now p may be invalid

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