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rename examples to manuals

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BlackMATov
2023-01-10 13:36:31 +07:00
parent fe77d5c282
commit 6d673b3cc7
12 changed files with 12 additions and 10 deletions
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47
develop/manuals/meta_examples/variable_example.cpp
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/*******************************************************************************
* This file is part of the "https://github.com/blackmatov/meta.hpp"
* For conditions of distribution and use, see copyright notice in LICENSE.md
* Copyright (C) 2021-2023, by Matvey Cherevko (blackmatov@gmail.com)
******************************************************************************/
#include "../meta_manuals.hpp"
namespace
{
const double pi_v{3.1415926536};
const double sqrt2_v{1.4142135624};
}
TEST_CASE("meta/meta_examples/variable/usage") {
namespace meta = meta_hpp;
// 'constants' local scope declaration
const meta::scope constants_scope = meta::local_scope_("constants")
.variable_("pi_v", &pi_v)
.variable_("sqrt2_v", &sqrt2_v);
// finds the variable by name 'pi_v'
const meta::variable pi_variable = constants_scope.get_variable("pi_v");
// checks the type and data type of the found variable
CHECK(pi_variable.get_type() == meta::resolve_type<const double*>());
CHECK(pi_variable.get_type().get_data_type() == meta::resolve_type<double>());
// retrieves a variable value
const meta::uvalue pi_variable_value = pi_variable.get();
// checks the type of the retrieved value
CHECK(pi_variable_value.get_type() == meta::resolve_type<double>());
// checks the typed variable value
CHECK(pi_variable_value.get_as<double>() == doctest::Approx(3.14).epsilon(0.01));
// we can change variable values, but only non-const
CHECK_THROWS(pi_variable.set(6.0));
// prints all variables in the scope
std::cout << "* " << constants_scope.get_name() << std::endl;
for ( auto&& [index, variable] : constants_scope.get_variables() ) {
std::cout << " - " << index.get_name() << ":" << variable.get() << std::endl;
}
}