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48 lines
1.7 KiB
C++
48 lines
1.7 KiB
C++
/*******************************************************************************
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* This file is part of the "https://github.com/blackmatov/meta.hpp"
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* For conditions of distribution and use, see copyright notice in LICENSE.md
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* Copyright (C) 2021, by Matvey Cherevko (blackmatov@gmail.com)
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******************************************************************************/
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#include "../meta_manuals.hpp"
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namespace
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{
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const double pi_v{3.1415926536};
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const double sqrt2_v{1.4142135624};
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}
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TEST_CASE("meta/meta_examples/variables/usage") {
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namespace meta = meta_hpp;
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// 'constants' local scope declaration
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const meta::scope constants_scope = meta::local_scope_("constants")
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.variable_("pi_v", &pi_v)
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.variable_("sqrt2_v", &sqrt2_v);
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// finds the variable by name 'pi_v'
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const meta::variable pi_variable = constants_scope.get_variable("pi_v");
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// checks the type and data type of the founded variable
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CHECK(pi_variable.get_type() == meta::resolve_type<const double*>());
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CHECK(pi_variable.get_type().get_data_type() == meta::resolve_type<double>());
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// retrieves a variable value
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const meta::value pi_variable_value = pi_variable.get();
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// checks the type of the retrieved value
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CHECK(pi_variable_value.get_type() == meta::resolve_type<double>());
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// checks the typed variable value
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CHECK(pi_variable_value.cast<double>() == doctest::Approx(3.14).epsilon(0.01));
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// we can change variable values, but only non-const
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CHECK_THROWS(pi_variable.set(6.0));
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// prints all variables in the scope
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fmt::print("* {}:\n", constants_scope.get_name());
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for ( auto&& [index, variable] : constants_scope.get_variables() ) {
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fmt::print(" - {}:{}\n", index.name, variable.get());
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}
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}
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