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https://github.com/jart/cosmopolitan.git
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e38a6e7996
The mangled name of a C++ function will typically not vary by const-ness of a by-value parameter; in other words, there is no meaning to a const- qualified by-value parameter in a function prototype. However, the const keyword _does_ matter at function _definition_ time, like it does with a variable declared in the body. So for prototypes, we strip out const for by-value parameters; but for definitions, we leave them alone. At function definition (as opposed to prototype), we add const to values in parameters by default, unless we’re going to mutate them. This commit also changes a couple of const string_view& to be simply by- value string_view. A string_view is only two words; it rarely ever makes sense to pass one by reference if it’s not going to be mutated.
111 lines
2.6 KiB
C++
111 lines
2.6 KiB
C++
// -*- mode:c++; indent-tabs-mode:nil; c-basic-offset:4; coding:utf-8 -*-
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// vi: set et ft=cpp ts=4 sts=4 sw=4 fenc=utf-8 :vi
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//
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// Copyright 2024 Justine Alexandra Roberts Tunney
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//
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// Permission to use, copy, modify, and/or distribute this software for
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// any purpose with or without fee is hereby granted, provided that the
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// above copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
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// WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
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// AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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// DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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// PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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// TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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// PERFORMANCE OF THIS SOFTWARE.
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#include "string_view.h"
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#include <stdckdint.h>
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#include <string.h>
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#include "string.h"
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namespace ctl {
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size_t
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string_view::find(const char ch, const size_t pos) const noexcept
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{
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char* q;
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if (n && (q = (char*)memchr(p, ch, n)))
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return q - p;
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return npos;
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}
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size_t
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string_view::find(const string_view s, const size_t pos) const noexcept
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{
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char* q;
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if (pos > n)
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__builtin_trap();
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if ((q = (char*)memmem(p + pos, n - pos, s.p, s.n)))
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return q - p;
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return npos;
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}
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string_view
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string_view::substr(const size_t pos, size_t count) const noexcept
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{
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size_t last;
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if (pos > n)
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__builtin_trap();
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if (count > n - pos)
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count = n - pos;
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if (ckd_add(&last, pos, count))
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last = n;
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if (last > n)
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__builtin_trap();
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return string_view(p + pos, count);
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}
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bool
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string_view::operator==(const string_view s) const noexcept
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{
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if (n != s.n)
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return false;
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if (!n)
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return true;
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return !memcmp(p, s.p, n);
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}
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bool
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string_view::operator!=(const string_view s) const noexcept
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{
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if (n != s.n)
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return true;
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if (!n)
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return false;
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return !!memcmp(p, s.p, n);
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}
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bool
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string_view::contains(const string_view s) const noexcept
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{
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if (!s.n)
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return true;
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return !!memmem(p, n, s.p, s.n);
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}
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bool
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string_view::ends_with(const string_view s) const noexcept
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{
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if (n < s.n)
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return false;
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if (!s.n)
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return true;
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return !memcmp(p + n - s.n, s.p, s.n);
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}
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bool
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string_view::starts_with(const string_view s) const noexcept
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{
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if (n < s.n)
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return false;
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if (!s.n)
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return true;
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return !memcmp(p, s.p, s.n);
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}
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} // namespace ctl
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