RE: Add external SPI Flash Memory to Raspberry Pico - 5: pass STL containers as read-only parameters

andrethomas — Thu, 25 Jan 2024 17:29:26 GMT

Hi, do you still have a download link for the read() and write() portions of the library? The last one I could find was 20221203 but that predates the read() thanks!

RE: Add external SPI Flash Memory to Raspberry Pico - 5: pass STL containers as read-only parameters

Jan Cumps — Sun, 09 Apr 2023 11:54:47 GMT

side note:
In my write() method, I access the raw data buffer of the vector, via the [] operator:

[embed:dc8ab71f-3b98-42d9-b0f6-e21e02a0f8e2:523018da-2379-49e2-82fa-2f7e21dd7f94:type=c_cpp&text=std%3A%3Avector%3Cuint8_t%3E%20m25%3A%3Ardid%28%29%20%7B%0D%0A%20%20%20%20%2F%2F%20....%0D%0A%20%20%20%20spi_read_blocking%28spi%2C%200%2C%20%28%26v%5B0%5D%29%2C%20v.size%28%29%29%3B%20%2F%2F%20Manufacturer%20Identification%2C%20Device%20Identification%20%28Memory%20Type%20%7C%7C%20Memory%20Capacity%29%0D%0A%20%20%20%20%2F%2F%20...%0D%0A%7D]

You could think that this may give my method the powers to modify the raw buffer. But there is protection:

If the vector object is const-qualified, the function returns a const_reference. Otherwise, it returns a reference.

In my code, I pass the vector as a const reference. So it's const-qualified and the raw buffer can only be used in code that doesn't alter it.