deuterium | Fully typed SQL query builder for Rust | SQL Database library

Consider a space ship factory that makes space ships. when it produces a ship, it updates the current resources on the planet that it lives and also update the state of the spaceship storage. Hence, the space ship factory is a publisher for two observers. Namely, the resources on the planet and the space ship storage. . When using the observer design pattern, observers have to implement the update method that can be called by the publisher whenever the publisher wants to publish. The publisher stores a list of its observers in an Arraylist and call update by iterating through each observers like the following:

I am having an issue updating the value of a cell. Below is a test code I am running to just ensure I can update a cell value. There are no errors but the cells remain empty upon running the code.

Edit: I'm not very versed in the vba syntax so I have updated the code below to show what I am attempting to do. Basically I want to find a value corresponding with a certain material, then sum all values found. I know you say I am not inputting values but instead am pulling them. I believed I was initializing the variable. How do I input the value instead?

Here is the code I am having an issue with. I am simply trying to input the value "0" into column G when the value in the corresponding row in column B is Deuterium. The debugger tells me my error lies with the line containing the If statement.

I would like to use boost::spirit in order to extract the stoichiometry of compounds made of several elements from a brute formula. Within a given compound, my parser should be able to distinguish three kind of chemical element patterns:

• natural element made of a mixture of isotopes in natural abundance
• pure isotope
• mixture of isotopes in non-natural abundance

Those patterns are then used to parse such following compounds:

• "C" --> natural carbon made of C[12] and C[13] in natural abundance
• "CH4" --> methane made of natural carbon and hydrogen
• "C2H{H[1](0.8)H[2](0.2)}6" --> ethane made of natural C and non-natural H made of 80% of hydrogen and 20% of deuterium
• "U[235]" --> pure uranium 235

Obviously, the chemical element patterns can be in any order (e.g. CH[1]4 and H[1]4C ...) and frequencies.

I wrote my parser which is quite close to do the job but I still face one problem.

Here is my code: