BOOST_CONTRACT_ASSERT — Preferred way to assert contract conditions.
// In header: <boost/contract/assert.hpp> BOOST_CONTRACT_ASSERT(cond)
Any exception thrown from within a contract (preconditions, postconditions, exception guarantees, old value copies at body, class invariants, etc.) is interpreted by this library as a contract failure. Therefore, users can program contract assertions manually throwing an exception when an asserted condition is checked to be
false (this library will then call the appropriate contract failure handler
boost::contract::precondition_failure, etc.). However, it is preferred to use this macro because it expands to code that throws
boost::contract::assertion_failure with the correct assertion file name (using
FILE), line number (using
LINE), and asserted condition code so to produce informative error messages (C++11
func is not used here because in most cases it will simply expand to the internal compiler name of the lambda function used to program the contract conditions adding no specificity to the error message).