libs/assert/doc/html/assert.html

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 434 <body class="article toc2 toc-left">
 435 <div id="header">
 436 <h1>Boost.Assert</h1>
 437 <div class="details">
 438 <span id="author" class="author">Peter Dimov</span><br>
 439 </div>
 440 <div id="toc" class="toc2">
 441 <div id="toctitle">Table of Contents</div>
 442 <ul class="sectlevel1">
 443 <li><a href="#assertion_macros_boostassert_hpp">Assertion Macros, &lt;boost/assert.hpp&gt;</a>
 444 <ul class="sectlevel2">
 445 <li><a href="#boost_assert">BOOST_ASSERT</a></li>
 446 <li><a href="#boost_assert_msg">BOOST_ASSERT_MSG</a></li>
 447 <li><a href="#boost_verify">BOOST_VERIFY</a></li>
 448 <li><a href="#boost_verify_msg">BOOST_VERIFY_MSG</a></li>
 449 <li><a href="#boost_assert_is_void">BOOST_ASSERT_IS_VOID</a></li>
 450 </ul>
 451 </li>
 452 <li><a href="#current_function_macro_boostcurrent_function_hpp">Current Function Macro, &lt;boost/current_function.hpp&gt;</a>
 453 <ul class="sectlevel2">
 454 <li><a href="#boost_current_function">BOOST_CURRENT_FUNCTION</a></li>
 455 </ul>
 456 </li>
 457 <li><a href="#copyright_and_license">Appendix A: Copyright and License</a></li>
 458 </ul>
 459 </div>
 460 </div>
 461 <div id="content">
 462 <div id="preamble">
 463 <div class="sectionbody">
 464 <div class="paragraph">
 465 <p>The Boost.Assert library provides several configurable diagnostic macros
 466 similar in behavior and purpose to the standard macro <code>assert</code> from <code>&lt;cassert&gt;</code>.</p>
 467 </div>
 468 </div>
 469 </div>
 470 <div class="sect1">
 471 <h2 id="assertion_macros_boostassert_hpp">Assertion Macros, &lt;boost/assert.hpp&gt;</h2>
 472 <div class="sectionbody">
 473 <div class="sect2">
 474 <h3 id="boost_assert">BOOST_ASSERT</h3>
 475 <div class="paragraph">
 476 <p>The header <code>&lt;boost/assert.hpp&gt;</code> defines the macro <code>BOOST_ASSERT</code>,
 477 which is similar to the standard <code>assert</code> macro defined in <code>&lt;cassert&gt;</code>.
 478 The macro is intended to be used in both Boost libraries and user
 479 code.</p>
 480 </div>
 481 <div class="ulist">
 482 <ul>
 483 <li>
 484 <p>By default, <code>BOOST_ASSERT(expr)</code> expands to <code>assert(expr)</code>.</p>
 485 </li>
 486 <li>
 487 <p>If the macro <code>BOOST_DISABLE_ASSERTS</code> is defined when <code>&lt;boost/assert.hpp&gt;</code>
 488 is included, <code>BOOST_ASSERT(expr)</code> expands to <code>((void)0)</code>, regardless of whether
 489 the macro <code>NDEBUG</code> is defined. This allows users to selectively disable <code>BOOST_ASSERT</code> without
 490 affecting the definition of the standard <code>assert</code>.</p>
 491 </li>
 492 <li>
 493 <p>If the macro <code>BOOST_ENABLE_ASSERT_HANDLER</code> is defined when <code>&lt;boost/assert.hpp&gt;</code>
 494 is included, <code>BOOST_ASSERT(expr)</code> expands to</p>
 495 <div class="listingblock">
 496 <div class="content">
 497 <pre class="highlight"><code>(BOOST_LIKELY(!!(expr))? ((void)0): ::boost::assertion_failed(#expr,
 498     BOOST_CURRENT_FUNCTION, __FILE__, __LINE__))</code></pre>
 499 </div>
 500 </div>
 501 <div class="paragraph">
 502 <p>That is, it evaluates <code>expr</code> and if it&#8217;s false, calls
 503 <code>::boost::assertion_failed(#expr, <a href="#boost_current_function">BOOST_CURRENT_FUNCTION</a>, __FILE__, __LINE__)</code>.
 504 This is true regardless of whether <code>NDEBUG</code> is defined.</p>
 505 </div>
 506 <div class="paragraph">
 507 <p><code>boost::assertion_failed</code> is declared in <code>&lt;boost/assert.hpp&gt;</code> as</p>
 508 </div>
 509 <div class="listingblock">
 510 <div class="content">
 511 <pre class="highlight"><code>namespace boost
 512 {
 513     void assertion_failed(char const * expr, char const * function,
 514         char const * file, long line);
 515 }</code></pre>
 516 </div>
 517 </div>
 518 <div class="paragraph">
 519 <p>but it is never defined. The user is expected to supply an appropriate definition.</p>
 520 </div>
 521 </li>
 522 <li>
 523 <p>If the macro <code>BOOST_ENABLE_ASSERT_DEBUG_HANDLER</code> is defined when <code>&lt;boost/assert.hpp&gt;</code>
 524 is included, <code>BOOST_ASSERT(expr)</code> expands to <code>((void)0)</code> when <code>NDEBUG</code> is
 525 defined. Otherwise the behavior is as if <code>BOOST_ENABLE_ASSERT_HANDLER</code> has been defined.</p>
 526 </li>
 527 </ul>
 528 </div>
 529 <div class="paragraph">
 530 <p>As is the case with <code>&lt;cassert&gt;</code>, <code>&lt;boost/assert.hpp&gt;</code>
 531 can be included multiple times in a single translation unit. <code>BOOST_ASSERT</code>
 532 will be redefined each time as specified above.</p>
 533 </div>
 534 </div>
 535 <div class="sect2">
 536 <h3 id="boost_assert_msg">BOOST_ASSERT_MSG</h3>
 537 <div class="paragraph">
 538 <p>The macro <code>BOOST_ASSERT_MSG</code> is similar to <code>BOOST_ASSERT</code>, but it takes an additional argument,
 539 a character literal, supplying an error message.</p>
 540 </div>
 541 <div class="ulist">
 542 <ul>
 543 <li>
 544 <p>By default, <code>BOOST_ASSERT_MSG(expr,msg)</code> expands to <code>assert((expr)&amp;&amp;(msg))</code>.</p>
 545 </li>
 546 <li>
 547 <p>If the macro <code>BOOST_DISABLE_ASSERTS</code> is defined when <code>&lt;boost/assert.hpp&gt;</code>
 548 is included, <code>BOOST_ASSERT_MSG(expr,msg)</code> expands to <code>((void)0)</code>, regardless of whether
 549 the macro <code>NDEBUG</code> is defined.</p>
 550 </li>
 551 <li>
 552 <p>If the macro <code>BOOST_ENABLE_ASSERT_HANDLER</code> is defined when <code>&lt;boost/assert.hpp&gt;</code>
 553 is included, <code>BOOST_ASSERT_MSG(expr,msg)</code> expands to</p>
 554 <div class="listingblock">
 555 <div class="content">
 556 <pre class="highlight"><code>(BOOST_LIKELY(!!(expr))? ((void)0): ::boost::assertion_failed_msg(#expr,
 557     msg, BOOST_CURRENT_FUNCTION, __FILE__, __LINE__))</code></pre>
 558 </div>
 559 </div>
 560 <div class="paragraph">
 561 <p>This is true regardless of whether <code>NDEBUG</code> is defined.</p>
 562 </div>
 563 <div class="paragraph">
 564 <p><code>boost::assertion_failed_msg</code> is declared in <code>&lt;boost/assert.hpp&gt;</code> as</p>
 565 </div>
 566 <div class="listingblock">
 567 <div class="content">
 568 <pre class="highlight"><code>namespace boost
 569 {
 570     void assertion_failed_msg(char const * expr, char const * msg,
 571         char const * function, char const * file, long line);
 572 }</code></pre>
 573 </div>
 574 </div>
 575 <div class="paragraph">
 576 <p>but it is never defined. The user is expected to supply an appropriate definition.</p>
 577 </div>
 578 </li>
 579 <li>
 580 <p>If the macro <code>BOOST_ENABLE_ASSERT_DEBUG_HANDLER</code> is defined when <code>&lt;boost/assert.hpp&gt;</code>
 581 is included, <code>BOOST_ASSERT_MSG(expr)</code> expands to <code>((void)0)</code> when <code>NDEBUG</code> is
 582 defined. Otherwise the behavior is as if <code>BOOST_ENABLE_ASSERT_HANDLER</code> has been defined.</p>
 583 </li>
 584 </ul>
 585 </div>
 586 <div class="paragraph">
 587 <p>As is the case with <code>&lt;cassert&gt;</code>, <code>&lt;boost/assert.hpp&gt;</code>
 588 can be included multiple times in a single translation unit. <code>BOOST_ASSERT_MSG</code>
 589 will be redefined each time as specified above.</p>
 590 </div>
 591 </div>
 592 <div class="sect2">
 593 <h3 id="boost_verify">BOOST_VERIFY</h3>
 594 <div class="paragraph">
 595 <p>The macro <code>BOOST_VERIFY</code> has the same behavior as <code>BOOST_ASSERT</code>, except that
 596 the expression that is passed to <code>BOOST_VERIFY</code> is always
 597 evaluated. This is useful when the asserted expression has desirable side
 598 effects; it can also help suppress warnings about unused variables when the
 599 only use of the variable is inside an assertion.</p>
 600 </div>
 601 <div class="ulist">
 602 <ul>
 603 <li>
 604 <p>If the macro <code>BOOST_DISABLE_ASSERTS</code> is defined when <code>&lt;boost/assert.hpp&gt;</code>
 605 is included, <code>BOOST_VERIFY(expr)</code> expands to <code>((void)(expr))</code>.</p>
 606 </li>
 607 <li>
 608 <p>If the macro <code>BOOST_ENABLE_ASSERT_HANDLER</code> is defined when <code>&lt;boost/assert.hpp&gt;</code>
 609 is included, <code>BOOST_VERIFY(expr)</code> expands to <code>BOOST_ASSERT(expr)</code>.</p>
 610 </li>
 611 <li>
 612 <p>Otherwise, <code>BOOST_VERIFY(expr)</code> expands to <code>((void)(expr))</code> when <code>NDEBUG</code> is
 613 defined, to <code>BOOST_ASSERT(expr)</code> when it&#8217;s not.</p>
 614 </li>
 615 </ul>
 616 </div>
 617 </div>
 618 <div class="sect2">
 619 <h3 id="boost_verify_msg">BOOST_VERIFY_MSG</h3>
 620 <div class="paragraph">
 621 <p>The macro <code>BOOST_VERIFY_MSG</code> is similar to <code>BOOST_VERIFY</code>, with an additional parameter, an error message.</p>
 622 </div>
 623 <div class="ulist">
 624 <ul>
 625 <li>
 626 <p>If the macro <code>BOOST_DISABLE_ASSERTS</code> is defined when <code>&lt;boost/assert.hpp&gt;</code>
 627 is included, <code>BOOST_VERIFY_MSG(expr,msg)</code> expands to <code>((void)(expr))</code>.</p>
 628 </li>
 629 <li>
 630 <p>If the macro <code>BOOST_ENABLE_ASSERT_HANDLER</code> is defined when <code>&lt;boost/assert.hpp&gt;</code>
 631 is included, <code>BOOST_VERIFY_MSG(expr,msg)</code> expands to <code>BOOST_ASSERT_MSG(expr,msg)</code>.</p>
 632 </li>
 633 <li>
 634 <p>Otherwise, <code>BOOST_VERIFY_MSG(expr,msg)</code> expands to <code>((void)(expr))</code> when <code>NDEBUG</code> is
 635 defined, to <code>BOOST_ASSERT_MSG(expr,msg)</code> when it&#8217;s not.</p>
 636 </li>
 637 </ul>
 638 </div>
 639 </div>
 640 <div class="sect2">
 641 <h3 id="boost_assert_is_void">BOOST_ASSERT_IS_VOID</h3>
 642 <div class="paragraph">
 643 <p>The macro <code>BOOST_ASSERT_IS_VOID</code> is defined when <code>BOOST_ASSERT</code> and <code>BOOST_ASSERT_MSG</code> are expanded to <code>((void)0)</code>.
 644 Its purpose is to avoid compiling and potentially running code that is only intended to prepare data to be used in the assertion.</p>
 645 </div>
 646 <div class="listingblock">
 647 <div class="content">
 648 <pre class="highlight"><code>void MyContainer::erase(iterator i)
 649 {
 650 // Some sanity checks, data must be ordered
 651 #ifndef BOOST_ASSERT_IS_VOID
 652
 653     if(i != c.begin()) {
 654         iterator prev = i;
 655         --prev;
 656         BOOST_ASSERT(*prev &lt; *i);
 657     }
 658     else if(i != c.end()) {
 659         iterator next = i;
 660         ++next;
 661         BOOST_ASSERT(*i &lt; *next);
 662     }
 663
 664 #endif
 665
 666     this-&gt;erase_impl(i);
 667 }</code></pre>
 668 </div>
 669 </div>
 670 <div class="ulist">
 671 <ul>
 672 <li>
 673 <p>By default, <code>BOOST_ASSERT_IS_VOID</code> is defined if <code>NDEBUG</code> is defined.</p>
 674 </li>
 675 <li>
 676 <p>If the macro <code>BOOST_DISABLE_ASSERTS</code> is defined, <code>BOOST_ASSERT_IS_VOID</code> is always defined.</p>
 677 </li>
 678 <li>
 679 <p>If the macro <code>BOOST_ENABLE_ASSERT_HANDLER</code> is defined, <code>BOOST_ASSERT_IS_VOID</code> is never defined.</p>
 680 </li>
 681 <li>
 682 <p>If the macro <code>BOOST_ENABLE_ASSERT_DEBUG_HANDLER</code> is defined, then <code>BOOST_ASSERT_IS_VOID</code> is defined when <code>NDEBUG</code> is defined.</p>
 683 </li>
 684 </ul>
 685 </div>
 686 </div>
 687 </div>
 688 </div>
 689 <div class="sect1">
 690 <h2 id="current_function_macro_boostcurrent_function_hpp">Current Function Macro, &lt;boost/current_function.hpp&gt;</h2>
 691 <div class="sectionbody">
 692 <div class="sect2">
 693 <h3 id="boost_current_function">BOOST_CURRENT_FUNCTION</h3>
 694 <div class="paragraph">
 695 <p>The header <code>&lt;boost/current_function.hpp&gt;</code> defines a single macro, <code>BOOST_CURRENT_FUNCTION</code>,
 696 similar to the C99 predefined identifier <code>__func__</code>.</p>
 697 </div>
 698 <div class="paragraph">
 699 <p><code>BOOST_CURRENT_FUNCTION</code> expands to a string literal containing
 700 the (fully qualified, if possible) name of the enclosing function. If there is
 701 no enclosing function, the behavior is unspecified.</p>
 702 </div>
 703 <div class="paragraph">
 704 <p>Some compilers do not provide a way to obtain the name of the current enclosing
 705 function. On such compilers, or when the macro <code>BOOST_DISABLE_CURRENT_FUNCTION</code>
 706 is defined, <code>BOOST_CURRENT_FUNCTION</code> expands to <code>"(unknown)"</code>.</p>
 707 </div>
 708 <div class="paragraph">
 709 <p><code>BOOST_DISABLE_CURRENT_FUNCTION</code> addresses a use case in which the programmer
 710 wishes to eliminate the string literals produced by <code>BOOST_CURRENT_FUNCTION</code> from
 711 the final executable for security reasons.</p>
 712 </div>
 713 </div>
 714 </div>
 715 </div>
 716 <div class="sect1">
 717 <h2 id="copyright_and_license">Appendix A: Copyright and License</h2>
 718 <div class="sectionbody">
 719 <div class="paragraph">
 720 <p>This documentation is</p>
 721 </div>
 722 <div class="ulist">
 723 <ul>
 724 <li>
 725 <p>Copyright 2002, 2007, 2014, 2017 Peter Dimov</p>
 726 </li>
 727 <li>
 728 <p>Copyright 2011 Beman Dawes</p>
 729 </li>
 730 <li>
 731 <p>Copyright 2015 Ion Gaztañaga</p>
 732 </li>
 733 <li>
 734 <p>Distributed under the <a href="http://www.boost.org/LICENSE_1_0.txt">Boost Software License, Version 1.0</a>.</p>
 735 </li>
 736 </ul>
 737 </div>
 738 </div>
 739 </div>
 740 </div>
 741 <div id="footer">
 742 <div id="footer-text">
 743 Last updated 2019-12-10 00:18:32 UTC
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