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c++ expression tree library\n\nhttp://jeremyko.blogspot.kr/2014/03/c-expression-tree.html\n\n# Usage \n\n## compile\n```\nmkdir build\ncd build\ncmake ..\nmake \n```\n\n## general arithmetic\n```cpp\nExpressionTree expTree;\nexpression_result* pExpressionRslt;\nbool bRslt = false;\n\nbRslt = expTree.SetInfixExpression(\"1 * -2 \");\nEXPECT_TRUE(bRslt);\nif (bRslt)\n{\n   bRslt = expTree.EvaluateExpression();\n   EXPECT_TRUE(bRslt);\n   pExpressionRslt = expTree.GetResult();\n   cout \u003c\u003c \"expTree.EvaluateExpression returns :\" \n        \u003c\u003c pExpressionRslt-\u003enResultLong \u003c\u003c \"\\n\";\n   EXPECT_EQ(-2, pExpressionRslt-\u003enResultLong);\n}\n```\n## custom user functions\n```cpp\n//see user_functions.h, user_functions.cpp\n//-----------------------------------------------------\nbRslt = expTree.SetInfixExpression(\"SumInt4(SumInt4(1,1+1,1+1,2), 1+1, 1+1, 1+1)\");\nEXPECT_TRUE(bRslt);\nbRslt = expTree.EvaluateExpression();\nEXPECT_TRUE(bRslt);\npExpressionRslt = expTree.GetResult();\ncout \u003c\u003c \"expTree.EvaluateExpression returns :\" \n     \u003c\u003c pExpressionRslt-\u003enResultLong \u003c\u003c \"\\n\";\nEXPECT_EQ(13, pExpressionRslt-\u003enResultLong);\n   \n//-----------------------------------------------------\nbRslt = expTree.SetInfixExpression(\"GetBool('1'='1')\");\nEXPECT_TRUE(bRslt);\nbRslt = expTree.EvaluateExpression();\nEXPECT_TRUE(bRslt);\n   \n//-----------------------------------------------------\nbRslt = expTree.SetInfixExpression(\"StrCat('ab','cd')=StrCat('a','b')+StrCat('c','d') \");\nEXPECT_TRUE(bRslt);\nbRslt = expTree.EvaluateExpression();\nEXPECT_TRUE(bRslt);\n   \n//-----------------------------------------------------\nbRslt = expTree.SetInfixExpression(\"StrCat3('1','2',StrCat3('a','b',StrCat3('X','Y','Z')) )\");\nEXPECT_TRUE(bRslt);\nbRslt = expTree.EvaluateExpression();\nEXPECT_TRUE(bRslt);\nEXPECT_EQ(4, expTree.GetDepth());\npExpressionRslt = expTree.GetResult();\ncout \u003c\u003c \"expTree.EvaluateExpression returns :\" \u003c\u003c pExpressionRslt-\u003estrResult \u003c\u003c \"\\n\";\nEXPECT_STREQ(\"12abXYZ\", pExpressionRslt-\u003estrResult);\n```\n\n## using placeholder\n```cpp\n// placeholder identifier is :$ph1, :$ph2, .... :$ph50 (max)\nbRslt = expTree.SetInfixExpression ( \":$ph1+:$ph2\" );\nEXPECT_TRUE ( bRslt );\nif ( bRslt )\n{\n    expTree.SetNumberLongValueOfPlaceHolder ( 1, 1 );\n    expTree.SetNumberLongValueOfPlaceHolder ( 2, 2 );\n    bRslt = expTree.EvaluateExpression ( );\n    EXPECT_TRUE ( bRslt );\n    pExpressionRslt = expTree.GetResult ( );\n    cout \u003c\u003c \"expTree.EvaluateExpression returns :\" \u003c\u003c pExpressionRslt-\u003enResultLong \u003c\u003c \"\\n\";\n    EXPECT_EQ ( 3, pExpressionRslt-\u003enResultLong );\n        \n    //-----------------------------------------------------\n    //there's no rebuild tree\n    expTree.SetNumberFloatValueOfPlaceHolder ( 1, 2.0f );\n    expTree.SetNumberFloatValueOfPlaceHolder ( 2, 3.0f );\n    bRslt = expTree.EvaluateExpression ( );\n    EXPECT_TRUE ( bRslt );\n    pExpressionRslt = expTree.GetResult ( );\n    cout \u003c\u003c \"expTree.EvaluateExpression returns :\" \u003c\u003c pExpressionRslt-\u003enResultFloat \u003c\u003c \"\\n\";\n    EXPECT_FLOAT_EQ ( 5.0f, pExpressionRslt-\u003enResultFloat );\n\n    //-----------------------------------------------------\n    expTree.SetStringValueOfPlaceHolder ( 1, \"A\" );\n    expTree.SetStringValueOfPlaceHolder ( 2, \"B\" );\n    bRslt = expTree.EvaluateExpression ( );\n    EXPECT_TRUE ( bRslt );\n    pExpressionRslt = expTree.GetResult ( );\n    cout \u003c\u003c \"expTree.EvaluateExpression returns :\" \u003c\u003c pExpressionRslt-\u003estrResult \u003c\u003c \"\\n\";\n    EXPECT_STREQ ( \"AB\", pExpressionRslt-\u003estrResult );\n}\n```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjeremyko%2Fexpression-tree-with-user-functions","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fjeremyko%2Fexpression-tree-with-user-functions","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjeremyko%2Fexpression-tree-with-user-functions/lists"}