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constants.md

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Constants and Macros

ruby-bindgen generates Ruby constants from top-level const variables with literal initializers:

const int CONST_INT = 10;
static const int STATIC_CONST_INT = 20;
const double CONST_DOUBLE = 3.14;

Generates:

CONST_INT = 10
STATIC_CONST_INT = 20
CONST_DOUBLE = 3.14

Macros

Macros are not added to bindings because their values are baked in at generation time and thus not read at runtime. This easily causes confusion. For example, a version macro like PROJ_VERSION_MAJOR would reflect whichever library version was used to generate bindings, not the version actually being used on your machine.