From aa844899c937bde5d2b24f276b59997e5b668bde Mon Sep 17 00:00:00 2001 From: Abseil Team Date: Thu, 8 Aug 2019 10:56:58 -0700 Subject: Creation of LTS branch "lts_2019_08_08" - 9ee91d3e430fb33a4590486573792eb0fa146c2d Export of internal Abseil changes by Abseil Team - 8efba58a3b656e9b41fb0471ae6453425a61c520 Export of internal Abseil changes by Abseil Team - b49b8d16b67ec6912899684b732e6367f258cfdb Export of internal Abseil changes by Abseil Team - 67222ffc4c83d918ce8395aa61769eeb77df4c4d Export of internal Abseil changes by Abseil Team - c5c4db4f5191fe5e76cbf68dcc71fb28702f7d2b Export of internal Abseil changes by Abseil Team - 14550beb3b7b97195e483fb74b5efb906395c31e Export of internal Abseil changes. by Abseil Team - 52e88ee56b72cf32bc66534d942c7398ce481331 Export of internal Abseil changes. by Abseil Team - 36d37ab992038f52276ca66b9da80c1cf0f57dc2 Export of internal Abseil changes. by Abseil Team - ad1485c8986246b2ae9105e512738d0e97aec887 Export of internal Abseil changes. by Abseil Team - 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968a34ffdaadd7db062a9621dfbdf8b2d16e05af Export of internal Abseil changes. by Abseil Team - 3e2e9b5557e76d098de4b8a2a659125b98ca519b Merge pull request #231 from uilianries/feature/conan by Mark Barolak - 111ca7060a6ff50115ca85b59f6b5d8c8c5e9105 Export of internal Abseil changes. by Abseil Team - 389ec3f906f018661a5308458d623d01f96d7b23 Export of internal Abseil changes. by Abseil Team - 8fbcdb90952c57828c4a9c2f6d79fcd7cae9088f Export of internal Abseil changes. by Abseil Team - 455dc17ba1af9635f0b60155bc565bc572a1e722 Export of internal Abseil changes. by Abseil Team - f197d7c72a54064cfde5a2058f1513a4a0ee36fb Export of internal Abseil changes. by Abseil Team - 284378a71b32dfb3af4e3661f585e671d1b603a3 Export of internal Abseil changes. by Abseil Team GitOrigin-RevId: 9ee91d3e430fb33a4590486573792eb0fa146c2d Change-Id: Ia06e548bc106cc9d136f6c65714be6645317aced --- absl/strings/str_join.h | 84 +++++++++++++++++++++++++------------------------ 1 file changed, 43 insertions(+), 41 deletions(-) (limited to 'absl/strings/str_join.h') diff --git a/absl/strings/str_join.h b/absl/strings/str_join.h index dc476a22..c6c0c98a 100644 --- a/absl/strings/str_join.h +++ b/absl/strings/str_join.h @@ -5,7 +5,7 @@ // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // -// http://www.apache.org/licenses/LICENSE-2.0 +// https://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, @@ -18,13 +18,13 @@ // ----------------------------------------------------------------------------- // // This header file contains functions for joining a range of elements and -// returning the result as a string. StrJoin operations are specified by passing -// a range, a separator string to use between the elements joined, and an -// optional Formatter responsible for converting each argument in the range to a -// string. If omitted, a default `AlphaNumFormatter()` is called on the elements -// to be joined, using the same formatting that `absl::StrCat()` uses. This -// package defines a number of default formatters, and you can define your own -// implementations. +// returning the result as a std::string. StrJoin operations are specified by +// passing a range, a separator string to use between the elements joined, and +// an optional Formatter responsible for converting each argument in the range +// to a string. If omitted, a default `AlphaNumFormatter()` is called on the +// elements to be joined, using the same formatting that `absl::StrCat()` uses. +// This package defines a number of default formatters, and you can define your +// own implementations. // // Ranges are specified by passing a container with `std::begin()` and // `std::end()` iterators, container-specific `begin()` and `end()` iterators, a @@ -37,8 +37,8 @@ // // Example: // -// std::vector v = {"foo", "bar", "baz"}; -// string s = absl::StrJoin(v, "-"); +// std::vector v = {"foo", "bar", "baz"}; +// std::string s = absl::StrJoin(v, "-"); // EXPECT_EQ("foo-bar-baz", s); // // See comments on the `absl::StrJoin()` function for more examples. @@ -60,23 +60,23 @@ #include "absl/strings/string_view.h" namespace absl { -inline namespace lts_2018_12_18 { +inline namespace lts_2019_08_08 { // ----------------------------------------------------------------------------- // Concept: Formatter // ----------------------------------------------------------------------------- // // A Formatter is a function object that is responsible for formatting its -// argument as a string and appending it to a given output string. Formatters -// may be implemented as function objects, lambdas, or normal functions. You may -// provide your own Formatter to enable `absl::StrJoin()` to work with arbitrary -// types. +// argument as a string and appending it to a given output std::string. +// Formatters may be implemented as function objects, lambdas, or normal +// functions. You may provide your own Formatter to enable `absl::StrJoin()` to +// work with arbitrary types. // // The following is an example of a custom Formatter that simply uses -// `std::to_string()` to format an integer as a string. +// `std::to_string()` to format an integer as a std::string. // // struct MyFormatter { -// void operator()(string* out, int i) const { +// void operator()(std::string* out, int i) const { // out->append(std::to_string(i)); // } // }; @@ -85,7 +85,7 @@ inline namespace lts_2018_12_18 { // argument to `absl::StrJoin()`: // // std::vector v = {1, 2, 3, 4}; -// string s = absl::StrJoin(v, "-", MyFormatter()); +// std::string s = absl::StrJoin(v, "-", MyFormatter()); // EXPECT_EQ("1-2-3-4", s); // // The following standard formatters are provided within this file: @@ -157,7 +157,7 @@ DereferenceFormatter() { // StrJoin() // ----------------------------------------------------------------------------- // -// Joins a range of elements and returns the result as a string. +// Joins a range of elements and returns the result as a std::string. // `absl::StrJoin()` takes a range, a separator string to use between the // elements joined, and an optional Formatter responsible for converting each // argument in the range to a string. @@ -168,22 +168,22 @@ DereferenceFormatter() { // Example 1: // // Joins a collection of strings. This pattern also works with a collection // // of `absl::string_view` or even `const char*`. -// std::vector v = {"foo", "bar", "baz"}; -// string s = absl::StrJoin(v, "-"); +// std::vector v = {"foo", "bar", "baz"}; +// std::string s = absl::StrJoin(v, "-"); // EXPECT_EQ("foo-bar-baz", s); // // Example 2: // // Joins the values in the given `std::initializer_list<>` specified using // // brace initialization. This pattern also works with an initializer_list // // of ints or `absl::string_view` -- any `AlphaNum`-compatible type. -// string s = absl::StrJoin({"foo", "bar", "baz"}, "-"); +// std::string s = absl::StrJoin({"foo", "bar", "baz"}, "-"); // EXPECT_EQ("foo-bar-baz", s); // // Example 3: // // Joins a collection of ints. This pattern also works with floats, // // doubles, int64s -- any `StrCat()`-compatible type. // std::vector v = {1, 2, 3, -4}; -// string s = absl::StrJoin(v, "-"); +// std::string s = absl::StrJoin(v, "-"); // EXPECT_EQ("1-2-3--4", s); // // Example 4: @@ -194,7 +194,7 @@ DereferenceFormatter() { // // `std::vector`. // int x = 1, y = 2, z = 3; // std::vector v = {&x, &y, &z}; -// string s = absl::StrJoin(v, "-"); +// std::string s = absl::StrJoin(v, "-"); // EXPECT_EQ("1-2-3", s); // // Example 5: @@ -203,65 +203,65 @@ DereferenceFormatter() { // v.emplace_back(new int(1)); // v.emplace_back(new int(2)); // v.emplace_back(new int(3)); -// string s = absl::StrJoin(v, "-"); +// std::string s = absl::StrJoin(v, "-"); // EXPECT_EQ("1-2-3", s); // // Example 6: // // Joins a `std::map`, with each key-value pair separated by an equals // // sign. This pattern would also work with, say, a // // `std::vector>`. -// std::map m = { +// std::map m = { // std::make_pair("a", 1), // std::make_pair("b", 2), // std::make_pair("c", 3)}; -// string s = absl::StrJoin(m, ",", absl::PairFormatter("=")); +// std::string s = absl::StrJoin(m, ",", absl::PairFormatter("=")); // EXPECT_EQ("a=1,b=2,c=3", s); // // Example 7: // // These examples show how `absl::StrJoin()` handles a few common edge // // cases: -// std::vector v_empty; +// std::vector v_empty; // EXPECT_EQ("", absl::StrJoin(v_empty, "-")); // -// std::vector v_one_item = {"foo"}; +// std::vector v_one_item = {"foo"}; // EXPECT_EQ("foo", absl::StrJoin(v_one_item, "-")); // -// std::vector v_empty_string = {""}; +// std::vector v_empty_string = {""}; // EXPECT_EQ("", absl::StrJoin(v_empty_string, "-")); // -// std::vector v_one_item_empty_string = {"a", ""}; +// std::vector v_one_item_empty_string = {"a", ""}; // EXPECT_EQ("a-", absl::StrJoin(v_one_item_empty_string, "-")); // -// std::vector v_two_empty_string = {"", ""}; +// std::vector v_two_empty_string = {"", ""}; // EXPECT_EQ("-", absl::StrJoin(v_two_empty_string, "-")); // // Example 8: // // Joins a `std::tuple` of heterogeneous types, converting each to -// // a string using the `absl::AlphaNum` class. -// string s = absl::StrJoin(std::make_tuple(123, "abc", 0.456), "-"); +// // a std::string using the `absl::AlphaNum` class. +// std::string s = absl::StrJoin(std::make_tuple(123, "abc", 0.456), "-"); // EXPECT_EQ("123-abc-0.456", s); template std::string StrJoin(Iterator start, Iterator end, absl::string_view sep, - Formatter&& fmt) { + Formatter&& fmt) { return strings_internal::JoinAlgorithm(start, end, sep, fmt); } template std::string StrJoin(const Range& range, absl::string_view separator, - Formatter&& fmt) { + Formatter&& fmt) { return strings_internal::JoinRange(range, separator, fmt); } template std::string StrJoin(std::initializer_list il, absl::string_view separator, - Formatter&& fmt) { + Formatter&& fmt) { return strings_internal::JoinRange(il, separator, fmt); } template std::string StrJoin(const std::tuple& value, absl::string_view separator, - Formatter&& fmt) { + Formatter&& fmt) { return strings_internal::JoinAlgorithm(value, separator, fmt); } @@ -276,16 +276,18 @@ std::string StrJoin(const Range& range, absl::string_view separator) { } template -std::string StrJoin(std::initializer_list il, absl::string_view separator) { +std::string StrJoin(std::initializer_list il, + absl::string_view separator) { return strings_internal::JoinRange(il, separator); } template -std::string StrJoin(const std::tuple& value, absl::string_view separator) { +std::string StrJoin(const std::tuple& value, + absl::string_view separator) { return strings_internal::JoinAlgorithm(value, separator, AlphaNumFormatter()); } -} // inline namespace lts_2018_12_18 +} // inline namespace lts_2019_08_08 } // namespace absl #endif // ABSL_STRINGS_STR_JOIN_H_ -- cgit v1.2.3