Initial Course

modules/12_cpp20/src/concepts.cpp

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+#include "concepts.hpp"
+
+namespace cpp20 {
+
+auto sum_integral(const std::vector<int>& data) -> int {
+    (void)data;
+    return 0;
+}
+
+}  // namespace cpp20

modules/12_cpp20/src/ranges.cpp

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+#include "ranges.hpp"
+
+namespace cpp20 {
+
+auto even_numbers(const std::vector<int>& input) -> std::vector<int> {
+    (void)input;
+    return {};
+}
+
+auto take_first_three(const std::vector<int>& input) -> std::vector<int> {
+    (void)input;
+    return {};
+}
+
+auto join_strings(const std::vector<std::string>& parts) -> std::string {
+    (void)parts;
+    return {};
+}
+
+}  // namespace cpp20

modules/12_cpp20/src/spaceship_operator.cpp

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+#include "spaceship_operator.hpp"
+
+namespace cpp20 {
+
+auto sort_versions(std::vector<Version> versions) -> std::vector<Version> {
+    (void)versions;
+    return {};
+}
+
+auto is_sorted_versions(const std::vector<Version>& versions) -> bool {
+    (void)versions;
+    return false;
+}
+
+}  // namespace cpp20

modules/12_cpp20/src/span.cpp

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+#include "span.hpp"
+
+namespace cpp20 {
+
+auto span_sum(std::span<const int> data) -> int {
+    (void)data;
+    return 0;
+}
+
+auto first_and_last(std::span<const int> data) -> std::pair<int, int> {
+    (void)data;
+    return {0, 0};
+}
+
+auto make_subspan(std::span<const int> data, std::size_t offset, std::size_t count)
+    -> std::vector<int> {
+    (void)data; (void)offset; (void)count;
+    return {};
+}
+
+}  // namespace cpp20