mirror of
https://github.com/catchorg/Catch2.git
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260 lines
10 KiB
C++
260 lines
10 KiB
C++
/*
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* Created by Phil Nash on 8/8/2017.
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* Copyright 2017 Two Blue Cubes Ltd. All rights reserved.
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*
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* Distributed under the Boost Software License, Version 1.0. (See accompanying
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* file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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*/
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#ifndef TWOBLUECUBES_CATCH_DECOMPOSER_H_INCLUDED
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#define TWOBLUECUBES_CATCH_DECOMPOSER_H_INCLUDED
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#include "catch_tostring.h"
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#include "catch_stringref.h"
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#include "catch_meta.hpp"
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#include <iosfwd>
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#ifdef _MSC_VER
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#pragma warning(push)
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#pragma warning(disable:4389) // '==' : signed/unsigned mismatch
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#pragma warning(disable:4018) // more "signed/unsigned mismatch"
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#pragma warning(disable:4312) // Converting int to T* using reinterpret_cast (issue on x64 platform)
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#pragma warning(disable:4180) // qualifier applied to function type has no meaning
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#pragma warning(disable:4800) // Forcing result to true or false
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#endif
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namespace Catch {
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struct ITransientExpression {
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auto isBinaryExpression() const -> bool { return m_isBinaryExpression; }
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auto getResult() const -> bool { return m_result; }
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virtual void streamReconstructedExpression( std::ostream &os ) const = 0;
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ITransientExpression( bool isBinaryExpression, bool result )
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: m_isBinaryExpression( isBinaryExpression ),
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m_result( result )
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{}
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// We don't actually need a virtual destructor, but many static analysers
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// complain if it's not here :-(
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virtual ~ITransientExpression();
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bool m_isBinaryExpression;
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bool m_result;
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};
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void formatReconstructedExpression( std::ostream &os, std::string const& lhs, StringRef op, std::string const& rhs );
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template<typename LhsT, typename RhsT>
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class BinaryExpr : public ITransientExpression {
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LhsT m_lhs;
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StringRef m_op;
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RhsT m_rhs;
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void streamReconstructedExpression( std::ostream &os ) const override {
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formatReconstructedExpression
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( os, Catch::Detail::stringify( m_lhs ), m_op, Catch::Detail::stringify( m_rhs ) );
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}
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public:
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BinaryExpr( bool comparisonResult, LhsT lhs, StringRef op, RhsT rhs )
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: ITransientExpression{ true, comparisonResult },
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m_lhs( lhs ),
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m_op( op ),
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m_rhs( rhs )
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{}
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template<typename T>
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auto operator && ( T ) const -> BinaryExpr<LhsT, RhsT const&> const {
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static_assert(always_false<T>::value,
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"chained comparisons are not supported inside assertions, "
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"wrap the expression inside parentheses, or decompose it");
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}
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template<typename T>
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auto operator || ( T ) const -> BinaryExpr<LhsT, RhsT const&> const {
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static_assert(always_false<T>::value,
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"chained comparisons are not supported inside assertions, "
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"wrap the expression inside parentheses, or decompose it");
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}
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template<typename T>
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auto operator == ( T ) const -> BinaryExpr<LhsT, RhsT const&> const {
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static_assert(always_false<T>::value,
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"chained comparisons are not supported inside assertions, "
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"wrap the expression inside parentheses, or decompose it");
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}
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template<typename T>
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auto operator != ( T ) const -> BinaryExpr<LhsT, RhsT const&> const {
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static_assert(always_false<T>::value,
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"chained comparisons are not supported inside assertions, "
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"wrap the expression inside parentheses, or decompose it");
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}
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template<typename T>
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auto operator > ( T ) const -> BinaryExpr<LhsT, RhsT const&> const {
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static_assert(always_false<T>::value,
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"chained comparisons are not supported inside assertions, "
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"wrap the expression inside parentheses, or decompose it");
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}
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template<typename T>
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auto operator < ( T ) const -> BinaryExpr<LhsT, RhsT const&> const {
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static_assert(always_false<T>::value,
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"chained comparisons are not supported inside assertions, "
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"wrap the expression inside parentheses, or decompose it");
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}
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template<typename T>
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auto operator >= ( T ) const -> BinaryExpr<LhsT, RhsT const&> const {
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static_assert(always_false<T>::value,
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"chained comparisons are not supported inside assertions, "
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"wrap the expression inside parentheses, or decompose it");
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}
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template<typename T>
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auto operator <= ( T ) const -> BinaryExpr<LhsT, RhsT const&> const {
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static_assert(always_false<T>::value,
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"chained comparisons are not supported inside assertions, "
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"wrap the expression inside parentheses, or decompose it");
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}
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};
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template<typename LhsT>
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class UnaryExpr : public ITransientExpression {
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LhsT m_lhs;
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void streamReconstructedExpression( std::ostream &os ) const override {
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os << Catch::Detail::stringify( m_lhs );
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}
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public:
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explicit UnaryExpr( LhsT lhs )
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: ITransientExpression{ false, static_cast<bool>(lhs) },
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m_lhs( lhs )
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{}
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};
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// Specialised comparison functions to handle equality comparisons between ints and pointers (NULL deduces as an int)
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template<typename LhsT, typename RhsT>
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auto compareEqual( LhsT const& lhs, RhsT const& rhs ) -> bool { return static_cast<bool>(lhs == rhs); }
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template<typename T>
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auto compareEqual( T* const& lhs, int rhs ) -> bool { return lhs == reinterpret_cast<void const*>( rhs ); }
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template<typename T>
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auto compareEqual( T* const& lhs, long rhs ) -> bool { return lhs == reinterpret_cast<void const*>( rhs ); }
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template<typename T>
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auto compareEqual( int lhs, T* const& rhs ) -> bool { return reinterpret_cast<void const*>( lhs ) == rhs; }
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template<typename T>
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auto compareEqual( long lhs, T* const& rhs ) -> bool { return reinterpret_cast<void const*>( lhs ) == rhs; }
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template<typename LhsT, typename RhsT>
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auto compareNotEqual( LhsT const& lhs, RhsT&& rhs ) -> bool { return static_cast<bool>(lhs != rhs); }
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template<typename T>
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auto compareNotEqual( T* const& lhs, int rhs ) -> bool { return lhs != reinterpret_cast<void const*>( rhs ); }
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template<typename T>
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auto compareNotEqual( T* const& lhs, long rhs ) -> bool { return lhs != reinterpret_cast<void const*>( rhs ); }
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template<typename T>
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auto compareNotEqual( int lhs, T* const& rhs ) -> bool { return reinterpret_cast<void const*>( lhs ) != rhs; }
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template<typename T>
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auto compareNotEqual( long lhs, T* const& rhs ) -> bool { return reinterpret_cast<void const*>( lhs ) != rhs; }
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template<typename LhsT>
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class ExprLhs {
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LhsT m_lhs;
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public:
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explicit ExprLhs( LhsT lhs ) : m_lhs( lhs ) {}
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template<typename RhsT>
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auto operator == ( RhsT const& rhs ) -> BinaryExpr<LhsT, RhsT const&> const {
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return { compareEqual( m_lhs, rhs ), m_lhs, "==", rhs };
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}
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auto operator == ( bool rhs ) -> BinaryExpr<LhsT, bool> const {
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return { m_lhs == rhs, m_lhs, "==", rhs };
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}
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template<typename RhsT>
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auto operator != ( RhsT const& rhs ) -> BinaryExpr<LhsT, RhsT const&> const {
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return { compareNotEqual( m_lhs, rhs ), m_lhs, "!=", rhs };
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}
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auto operator != ( bool rhs ) -> BinaryExpr<LhsT, bool> const {
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return { m_lhs != rhs, m_lhs, "!=", rhs };
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}
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template<typename RhsT>
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auto operator > ( RhsT const& rhs ) -> BinaryExpr<LhsT, RhsT const&> const {
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return { static_cast<bool>(m_lhs > rhs), m_lhs, ">", rhs };
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}
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template<typename RhsT>
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auto operator < ( RhsT const& rhs ) -> BinaryExpr<LhsT, RhsT const&> const {
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return { static_cast<bool>(m_lhs < rhs), m_lhs, "<", rhs };
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}
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template<typename RhsT>
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auto operator >= ( RhsT const& rhs ) -> BinaryExpr<LhsT, RhsT const&> const {
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return { static_cast<bool>(m_lhs >= rhs), m_lhs, ">=", rhs };
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}
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template<typename RhsT>
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auto operator <= ( RhsT const& rhs ) -> BinaryExpr<LhsT, RhsT const&> const {
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return { static_cast<bool>(m_lhs <= rhs), m_lhs, "<=", rhs };
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}
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template <typename RhsT>
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auto operator | (RhsT const& rhs) -> BinaryExpr<LhsT, RhsT const&> const {
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return { static_cast<bool>(m_lhs | rhs), m_lhs, "|", rhs };
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}
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template <typename RhsT>
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auto operator & (RhsT const& rhs) -> BinaryExpr<LhsT, RhsT const&> const {
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return { static_cast<bool>(m_lhs & rhs), m_lhs, "&", rhs };
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}
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template <typename RhsT>
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auto operator ^ (RhsT const& rhs) -> BinaryExpr<LhsT, RhsT const&> const {
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return { static_cast<bool>(m_lhs ^ rhs), m_lhs, "^", rhs };
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}
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template<typename RhsT>
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auto operator && ( RhsT const& ) -> BinaryExpr<LhsT, RhsT const&> const {
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static_assert(always_false<RhsT>::value,
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"operator&& is not supported inside assertions, "
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"wrap the expression inside parentheses, or decompose it");
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}
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template<typename RhsT>
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auto operator || ( RhsT const& ) -> BinaryExpr<LhsT, RhsT const&> const {
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static_assert(always_false<RhsT>::value,
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"operator|| is not supported inside assertions, "
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"wrap the expression inside parentheses, or decompose it");
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}
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auto makeUnaryExpr() const -> UnaryExpr<LhsT> {
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return UnaryExpr<LhsT>{ m_lhs };
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}
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};
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void handleExpression( ITransientExpression const& expr );
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template<typename T>
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void handleExpression( ExprLhs<T> const& expr ) {
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handleExpression( expr.makeUnaryExpr() );
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}
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struct Decomposer {
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template<typename T>
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auto operator <= ( T const& lhs ) -> ExprLhs<T const&> {
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return ExprLhs<T const&>{ lhs };
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}
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auto operator <=( bool value ) -> ExprLhs<bool> {
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return ExprLhs<bool>{ value };
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}
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};
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} // end namespace Catch
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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#endif // TWOBLUECUBES_CATCH_DECOMPOSER_H_INCLUDED
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