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void validate(char const* first, char const* last) {
    for(; first != last; ++first) {
        if(*first == 'X') throw "How dare you put an 'X' here?";
    }
}
 
// Base
struct text {
    text(char const* first, char const* last)
    : storage(first, last) {} // need to pass first and last to validate() first
 
    std::string storage;
}
 
// Option #1
struct validated {
    validated(char const* first, char const* last) {
        validate(first, last);
    }
};
 
struct text : validated {
    text(char const* first, char const* last)
    : validated(first, last) // a bit ugly, if you ask me
      storage(first, last) {}
 
    std::string storage;
}
 

prog.cpp:12: error: ‘string’ in namespace ‘std’ does not name a type
prog.cpp: In constructor ‘text::text(const char*, const char*)’:
prog.cpp:10: error: class ‘text’ does not have any field named ‘storage’
prog.cpp: At global scope:
prog.cpp:20: error: multiple types in one declaration
prog.cpp:22: error: redefinition of ‘struct text’
prog.cpp:8: error: previous definition of ‘struct text’
prog.cpp:28: error: expected unqualified-id at end of input

Standard output is empty