mirror of
https://github.com/boostorg/contract.git
synced 2026-02-26 16:42:19 +00:00
28 lines
612 B
C++
28 lines
612 B
C++
|
|
//[n1962_sqrt
|
|
#include <boost/contract.hpp>
|
|
#include <boost/detail/lightweight_test.hpp>
|
|
#include <cmath>
|
|
|
|
double mysqrt(double x, double precision = 1e-6) {
|
|
double result;
|
|
auto c = boost::contract::function()
|
|
.precondition([&] {
|
|
BOOST_CONTRACT_ASSERT(x >= 0.0);
|
|
})
|
|
.postcondition([&] {
|
|
BOOST_CONTRACT_ASSERT(fabs(result * result - x) <= precision);
|
|
})
|
|
;
|
|
|
|
return result = sqrt(x);
|
|
}
|
|
|
|
int main() {
|
|
double const precision = 1e-6;
|
|
BOOST_TEST(fabs(mysqrt(4.0, precision) - 2.0) <= precision);
|
|
return boost::report_errors();
|
|
}
|
|
//]
|
|
|