How to get and set strings from and to a store?

[RobertoRoos]

I have a store like this:

{
    uint8=0 id
    string:32 name
}[5] boards

How are you supposed to get/set the string fields?

E.g. this...

const auto &store = Logging::Logger::GetNameStore();
const std::string realName = store.boards_0__name;

Failed to compile with the error:

error: conversion from ‘const stored::impl::StoreVariantV<stored::IDNameStoreBaseLogging::IDNameStore, Logging::IDNameStore, stored::Type::String, 2200, 32>’ to non-scalar type ‘const std::string’ {aka ‘const std::__cxx11::basic_string’} requested

Similarly on

const std:;string name = "hello";
m_nameStore.boards_0__name = name;

I get the error

error: no match for ‘operator=’ (operand types are ‘stored::impl::StoreVariantV<stored::IDNameStoreBaseLogging::IDNameStore, Logging::IDNameStore, stored::Type::String, 2000, 32>’ and ‘const std::string’ {aka ‘const std::__cxx11::basic_string’})

[RobertoRoos]

I found that

const std::string realName = store.io_0__name.get<const char *>();

At least compiles, but then the program dies in a runtime assertion inside Variant<>.get<>(), on:

	template <typename T>
	T get() const
	{
		stored_assert(Type::isFixed(type()));

EDIT: What I've got to run now is:

const auto *realName = reinterpret_cast<const char *>(store.io_0__name.buffer());

But this feels more hacky than it should. Can we add a mention of string access in the docs somewhere?

[RobertoRoos]

You're supposed to use the in-memory getter: size_t get(void* dst, size_t len = 0)

So e.g.:

        char str[32];
	store.text.get(str, 32);

It will copy up to and including a final null-terminator:

	char str[64];
	memset(str, 0xFF, 64);
	const auto bytes = store.text.get(str, 32);

	std::cout << "Bytes read: " << bytes << std::endl;

	for(int i = 0; i <= 20; i++)
		std::cout << str[i] << "\t";
	std::cout << std::endl;

	for(int i = 0; i <= 20; i++)
		std::cout << std::hex << (0xFFU & str[i]) << "\t";
	std::cout << std::endl;

> Bytes read: 12
> h       e       l       l       o               w       o       r       l       d       !               �       �       �       �       �       �       �       �
> 68      65      6c      6c      6f      20      77      6f      72      6c      64      21      0       ff      ff      ff      ff      ff      ff      ff      ff

I'll leave this issue open, I'll try to add a mention to the docs.