Add 'xo-expression/' from commit '5ac3c03a0c'

git-subtree-dir: xo-expression
git-subtree-mainline: d0f5ccc1ce
git-subtree-split: 5ac3c03a0c

xo-expression/example/CMakeLists.txt

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+add_subdirectory(ex1)

xo-expression/example/ex1/CMakeLists.txt

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+# xo-expression/example/ex1/CMakeLists.txt
+
+set(SELF_EXE xo_expression_ex1)
+set(SELF_SRCS ex1.cpp)
+
+if (XO_ENABLE_EXAMPLES)
+    xo_add_executable(${SELF_EXE} ${SELF_SRCS})
+    xo_self_dependency(${SELF_EXE} xo_expression)
+    xo_dependency(${SELF_EXE} refcnt)
+endif()
+
+# end CMakeLists.txt

xo-expression/example/ex1/ex1.cpp

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+/** @file ex1.cpp **/
+
+#include "xo/expression/Constant.hpp"
+#include "xo/expression/Primitive.hpp"
+#include "xo/expression/llvmintrinsic.hpp"
+#include <iostream>
+#include <cmath>
+
+int
+main() {
+    using xo::ast::make_constant;
+    using xo::ast::make_primitive;
+    using xo::ast::llvmintrinsic;
+    using std::cout;
+    using std::endl;
+
+    {
+        auto expr = make_constant(7);
+    }
+
+    {
+        auto expr = make_primitive("sqrt",
+                                   &::sqrt,
+                                   false /*!explicit_symbol_def*/,
+                                   llvmintrinsic::fp_sqrt);
+
+        auto expr_td = expr->value_td();
+
+        cout << "expr_td: " << expr_td->short_name() << endl;
+        cout << "expr_td->is_function(): " << expr_td->is_function() << endl;
+        cout << "expr_td->fn_retval(): " << expr_td->fn_retval()->short_name() << endl;
+        cout << "expr_td->n_fn_arg(): " << expr_td->n_fn_arg() << endl;
+        for (uint32_t i = 0; i < expr_td->n_fn_arg(); ++i)
+            cout << "expr_td->fn_arg(" << i << "): " << expr_td->fn_arg(i)->short_name() << endl;
+        cout << "expr_td->fn_is_noexcept(): " << expr_td->fn_is_noexcept() << endl;
+    }
+}
+
+/** end ex1.cpp **/