You need to decide on which Real type you want, perhaps
#include
and then chose perhaps a quad precision type like cpp_bin_float_quad for 128-bit precision
You can then either use a typedef to define Real
typedef cpp_bin_float_quad Real;
or pass cpp_bin_float_quad as a template parameter into your own function.
HTH
Paul
PS It would be nice if we had a fully worked example?
From: Boost-users On Behalf Of Anirban Pal via Boost-users
Sent: 14 August 2020 01:08
To: boost-users@lists.boost.org
Cc: Anirban Pal
Subject: [Boost-users] Difficulty using boost quadrature library
Hello everyone,
I'm new to using boost and I'm trying to use its quadrature routines, specifically
the tanh_sinh integrator. I'm trying to run the examples here:
https://www.boost.org/doc/libs/1_66_0/libs/math/doc/html/math_toolkit/double...
I've been successful using it with the double datatype. However, I can't seem to work with the Real datatype. When I run the following, I'm successful.
tanh_sinh<double> integrator;
auto f = [](double x) { return 5*x + 7; };
double Q = integrator.integrate(f);
Q = integrator.integrate(f, 0.0, 1.1);
But when I run the following:
auto f = [](Real x) { return log(x)*log(1-x); };
Real Q = integrator.integrate(f, (Real) 0, (Real) 1);
I get the error:
boost_test.cxx: In function ‘int main(int, char**)’:
boost_test.cxx:47:15: error: ‘Real’ has not been declared
auto f2 = [](Real x) { return log(x)*log(1-x); };
^~~~
boost_test.cxx:48:2: error: ‘Real’ was not declared in this scope
Real Q2 = integrator.integrate(f2, (Real) 0, (Real) 1);
I think I need to include the right headers for this to go away. However, I'm not sure what the correct header file is.
Thank you for your attention.
--
Anirban Pal
