121 lines
2.7 KiB
C++
121 lines
2.7 KiB
C++
/*
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* Copyright (C) 2019 Intel Corporation
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*
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* SPDX-License-Identifier: MIT
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*
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*/
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#pragma once
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#include <cinttypes>
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#include <string>
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constexpr size_t constLength(const char *string) {
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if (nullptr == string) {
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return 0U;
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}
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auto it = string;
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for (; *it != '\0'; ++it) {
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}
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return it - string;
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}
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class ConstStringRef {
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public:
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template <size_t Length>
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constexpr ConstStringRef(const char (&array)[Length]) noexcept
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: ptr(array), len(((Length > 0) && (array[Length - 1] == '\0')) ? (Length - 1) : Length) {
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}
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constexpr ConstStringRef(const char *const ptr, const size_t length) noexcept
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: ptr(ptr), len(length) {
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}
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ConstStringRef(const std::string &str) noexcept
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: ptr(str.data()), len(str.length()) {
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}
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constexpr const char *data() const noexcept {
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return ptr;
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}
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constexpr operator const char *() const noexcept {
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return ptr;
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}
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constexpr size_t size() const noexcept {
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return len;
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}
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constexpr size_t length() const noexcept {
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return len;
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}
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constexpr bool empty() const noexcept {
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return len == 0;
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}
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constexpr const char *begin() const noexcept {
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return ptr;
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}
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constexpr const char *end() const noexcept {
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return ptr + len;
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}
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protected:
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const char *const ptr;
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const size_t len;
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};
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constexpr bool equals(const ConstStringRef &lhs, const ConstStringRef &rhs) {
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if (lhs.size() != rhs.size()) {
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return false;
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}
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for (size_t i = 0, e = lhs.size(); i < e; ++i) {
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if (lhs[i] != rhs[i]) {
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return false;
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}
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}
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return true;
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}
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template <typename T = char>
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constexpr bool equals(const ConstStringRef &lhs, const T *rhs) {
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return equals(lhs, ConstStringRef(rhs, constLength(rhs)));
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}
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inline bool equals(const ConstStringRef &lhs, const std::string &rhs) {
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return equals(lhs, ConstStringRef(rhs.data(), rhs.length()));
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}
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constexpr bool operator==(const ConstStringRef &lhs, const ConstStringRef &rhs) {
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return equals(lhs, rhs);
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}
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template <typename RhsT>
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constexpr bool operator==(const ConstStringRef &lhs, const RhsT &rhs) {
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return equals(lhs, rhs);
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}
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template <typename LhsT>
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constexpr bool operator==(const LhsT &lhs, const ConstStringRef &rhs) {
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return equals(rhs, lhs);
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}
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constexpr bool operator!=(const ConstStringRef &lhs, const ConstStringRef &rhs) {
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return false == equals(lhs, rhs);
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}
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template <typename RhsT>
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constexpr bool operator!=(const ConstStringRef &lhs, const RhsT &rhs) {
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return false == (lhs == rhs);
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}
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template <typename LhsT>
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constexpr bool operator!=(const LhsT &lhs, const ConstStringRef &rhs) {
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return rhs != lhs;
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}
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