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parse.cpp File Reference
`#include <sstream>`
`#include "parse.hpp"`

Go to the source code of this file.

## Functions
void | parse_loop (std::istream &input, std::ostream &output)

## Function Documentation

void parse_loop | ( | std::istream & | input,
|  | std::ostream & | output
| ) |  |

Parse loop. Read expressions from `input` and print results to `output`.

Parameters

  input | The input stream.
  output | The output stream.

Definition at line 267 of file parse.cpp.

References parser::get_expr().

Referenced by BOOST_AUTO_TEST_CASE(), and main().

268 {
269 std::string line{};
270 // No portable way to test whether the console is an interactive terminal
271 // vs. a non-interactive file. If you have a system-specific way to test,
272 // output the prompt only for the interactive case.
273 for (output << "> "; std::getline(input, line); output << "> ") {
274 std::istringstream input{std::move(line)};
275 parser p(input);
276 try {
277 double x;
278 while (p.get_expr(x))
279 output << x << '\n';
280 } catch(parse_error const& ex) {
281 output << ex.what() << '\n';
282 } catch(std::exception const& ex) {
283 output << "exception: " << ex.what() << '\n';
284 }
285 }
286 }
parser
Definition: parse.hpp:31
parse_error
Definition: parse.hpp:14