对于以下Map无法插入到Map中
map<string, double> doubleProps = 4;
map<string, int32> intProps = 5;
map<string,string> stringProps=6;
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以下是我尝试过的,但它不起作用
doubleProps["key"]="value" //doesn't work
*(doubleProps["key"]).insert("value") //doesn't work
doubleProps.insert("key","value")
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