#include <iostream>
#include <map>
#include <string>
 
struct OrderBook {
	std::string symbol;
	OrderBook(std::string symbol) : symbol(symbol) {}
	void addOrder(std::string received_order) {
		std::cout << "adding order '" << received_order << "' into symbol '" << symbol << "'";
	}
};
 
int main() {
	std::map<std::string, OrderBook> buy_side_symbols;
	std::string symbol = "the symbol";
 
	auto symbol_iter = buy_side_symbols.find(symbol);
 
	if (symbol_iter == buy_side_symbols.end())
    	symbol_iter = buy_side_symbols.emplace(symbol, symbol).first;
 
	std::string received_order = "some book";
	symbol_iter->second.addOrder(received_order);
 
	return 0;
}

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