c_str_mutable()

char * fl::basic_string::c_str_mutable

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Definition at line 43 of file basic_string.cpp.hpp.

                                  {
    // Inline mode — already mutable
    if (mStorage.empty()) {
        return inlineBufferPtr();
    }
    struct Visitor {
        basic_string* self;
        char* result;
        void accept(NotNullStringHolderPtr& heap) {
            if (heap.get().use_count() > 1) {
                // COW: detach from shared data before returning mutable pointer
                self->mStorage = NotNullStringHolderPtr(
                    fl::make_shared<StringHolder>(heap->data(), self->mLength));
                result = self->heapData()->data();
            } else {
                result = heap->data();
            }
        }
        void accept(ConstLiteral&) {
            self->materialize();
            result = self->hasHeapData() ? self->heapData()->data()
                                         : self->inlineBufferPtr();
        }
        void accept(ConstView&) {
            self->materialize();
            result = self->hasHeapData() ? self->heapData()->data()
                                         : self->inlineBufferPtr();
        }
    };
    Visitor v{this, nullptr};
    mStorage.visit(v);
    return v.result;
}

References basic_string(), fl::not_null< T >::get(), hasHeapData(), heapData(), inlineBufferPtr(), fl::make_shared(), materialize(), mLength, mStorage, and fl::shared_ptr< T >::use_count().

Referenced by at(), begin(), clear(), end(), erase(), operator[](), pop_back(), and resize().

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