first commit

Author: Pramod-Devireddy

README.md

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+<p align="center">
+    <h1 align="center"> Go Mathematical Expression Toolkit </h1>
+</p>

exprtk.go

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+package exprtk
+
+// #cgo CXXFLAGS: -std=c++11
+// #cgo LDFLAGS: -L.
+// #include "exprtkwrapper.h"
+import "C"
+import "fmt"
+
+// GoExprtk ...Exprtk Structure
+type GoExprtk struct {
+	exprtk C.exprtkWrapper
+}
+
+// NewExprtk ... Creates a new object
+func NewExprtk() GoExprtk {
+	var obj GoExprtk
+	obj.exprtk = C.exprtkWrapperInit()
+	return obj
+}
+
+// SetExpression ... Sets an Expression
+func (obj GoExprtk) SetExpression(expr string) {
+	C.setExpressionString(obj.exprtk, C.CString(expr))
+}
+
+// AddDoubleVariable ... Adds variable to the expression
+func (obj GoExprtk) AddDoubleVariable(x string) {
+	C.addDoubleVariable(obj.exprtk, C.CString(x))
+}
+
+// AddStringVariable ... Adds variable to the expression
+func (obj GoExprtk) AddStringVariable(x string) {
+	C.addStringVariable(obj.exprtk, C.CString(x))
+}
+
+// AddVectorVariable ... Adds variable to the expression
+func (obj GoExprtk) AddVectorVariable(x string) {
+	C.addVectorVariable(obj.exprtk, C.CString(x))
+}
+
+// SetDoubleVariableValue ... Sets value to the variable
+func (obj GoExprtk) SetDoubleVariableValue(varName string, val float64) {
+	C.setDoubleVariableValue(obj.exprtk, C.CString(varName), C.double(val))
+}
+
+// SetStringVariableValue ... Sets value to the variable
+func (obj GoExprtk) SetStringVariableValue(varName string, val string) {
+	C.setStringVariableValue(obj.exprtk, C.CString(varName), C.CString(val))
+}
+
+// SetVectorVariableValue ... Sets value to the variable
+func (obj GoExprtk) SetVectorVariableValue(varName string, val []float64) {
+	arr := make([]C.double, 0)
+	for i := 0; i < len(val); i++ {
+		arr = append(arr, C.double(val[i]))
+	}
+	firstValue := &(arr[0])
+	var arrayLength C.int = C.int(len(arr))
+	C.setVectorVariableValue(obj.exprtk, C.CString(varName), firstValue, arrayLength)
+}
+
+// CompileExpression ... Compiles the Expression
+func (obj GoExprtk) CompileExpression() {
+	value := C.compileExpression(obj.exprtk)
+	if value == 0 {
+		fmt.Println("Equation didn't compile")
+	} else {
+		fmt.Println("Equation Compiled")
+	}
+}
+
+// GetEvaluatedValue ... Returns the evaluated value
+func (obj GoExprtk) GetEvaluatedValue() float64 {
+	return float64(C.getEvaluatedValue(obj.exprtk))
+}