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GILLES Sebastien authored
Previously, you had to fill each individual type of possibility for a Parameter, regardless of the one finally chosen. For instance, you had something like (skipping the documentation...): VolumicMass { nature = "constant" scalar = 1. lua_function = none piecewise_constant_domain_id = { } piecewise_constant_domain_value = { } } and each of these entries should be filled (a shortcut 'none' was however created for lua_function). This made the Lua files rather heavy, and moreover signaled the non used fields (here VolumicMass.lua_function, VolumicMass.piecewise_constant_domain_id and VolumicMass.piecewise_constant_domain_value) as unused. Now using up the strength of newly introduced in C++17 std::variant (or boost::variant for Apple Clang currently - see #1305), a more synthetic writing ha been introduced: VolumicMass { nature = "constant" value = 1. } where 'value' type depends on the...
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