json-validator/include/jvalidate/_macro.h

#pragma once

#define JVALIDATE_CONCAT2(A, B) A##B
#define JVALIDATE_CONCAT(A, B) JVALIDATE_CONCAT2(A, B)

#define JVALIDATE_IIF0(IF, ELSE) ELSE
#define JVALIDATE_IIF1(IF, ELSE) IF
#define JVALIDATE_IIF(CONDITIONAL, IF, ELSE) JVALIDATE_CONCAT(JVALIDATE_IIF, CONDITIONAL)(IF, ELSE)

/**
 * @brief Assert a certain pre/post-condition is true, else return the default
 * expression (or void).
 *
 * @param condition A boolean or boolean-like expression that should be TRUE.
 * If the condition is FALSE, then the other params are used to produce errors.
 *
 * @param ... Zero or One arguments representing the return value if the
 * condition is FALSE. Zero arguments is equivalent to `return void();`, which
 * doesn't need to be explicitly stated.
 */
#define JVALIDATE_RETURN_UNLESS(condition, ...)                                                    \
  if (!(condition)) [[unlikely]] {                                                                 \
    return __VA_ARGS__;                                                                            \
  }

/**
 * @brief Assert a certain pre/post-condition is false, else return the default
 * expression (or void).
 *
 * @param condition A boolean or boolean-like expression that should be FALSE.
 * If the condition is TRUE, then the other params are used to produce errors.
 *
 * @param ... Zero or One arguments representing the return value if the
 * condition is TRUE. Zero arguments is equivalent to `return void();`, which
 * doesn't need to be explicitly stated.
 */
#define JVALIDATE_RETURN_IF(condition, ...)                                                        \
  if (condition) [[unlikely]] {                                                                    \
    return __VA_ARGS__;                                                                            \
  }